The James Randi Educational Foundation
Foundation headed by professional magician exposes psychics, faith healers, and such. Offers $1.1 million to anyone who can actually demonstrate something supernatural.
http://www.randi.org

The Skeptics Society
The Skeptics Society is a scientific and educational organization of scholars, scientists, historians, magicians, professors and teachers, and anyone curious about controversial ideas, extraordinary claims, revolutionary ideas and the promotion of science.
http://www.skeptic.com

Skeptic News
Tracks new information on various skeptical web pages.
http://www.skepticnews.com/

Committee for the Scientific Investigation of Claims of the Paranormal
World-wide organization that encourages the critical investigation of paranormal and fringe-science claims from a responsible, scientific point of view.
http://www.csicop.org/

Bad Science
About well understood phenomena which are persistently presented incorrectly by teachers and writers.
http://www.ems.psu.edu/~fraser/BadScience.html

SIMPOS
Netherlands foundation for information on social problems and occult tendencies.
http://www.stelling.nl/simpos/simpoeng.htm

Skeptical References
A bibliography of materials for skeptics.
http://www.hutch.demon.co.uk/lewindex.htm

Free Inquiry
Argues for free inquiry and thought; the philosophies of naturalism, empiricism, rationalism, and skepticism.
http://www.freeinquiry.com/

Skeptic's Digest
Here you can access the best skeptical articles on the Web about the occult, paranormal, pseudoscience and other weird things
http://www.geocities.com/skepdigest/

Zetetics Laboratory
Laboratory at the University of Nice where paranormal phenomena are studied.
http://www.unice.fr/zetetique/

The Skeptic's Dictionary
Skeptical definitions and essays on occult, paranormal, pseudoscientific ideas and practices with references to skeptical literature.
http://skepdic.com/

#Skeptic IRC
Weekly internet relay chat for skeptics.
http://home.netcom.com/~bbaggins/skeptic.htm

Skeptical Information Links
Links to materials for skeptics, and about skepticism.
http://www.discord.org/skeptical/

The Skeptic's Refuge
Gateway to The Skeptic's Dictionary with skeptical articles on the occult, the supernatural, the paranormal and the pseudoscientific.
http://www.skepdic.com/refuge/

Skeptical Pages by Tommy Persson
Links to newsletters, organizations, and websites.
http://www.lysator.liu.se/skeptical/

Debunker's Domain
Dedicated to debunking all manner of dubious claims.
http://www.debunker.com

Psychologists Educating Students to Think Skeptically
PESTS is a meeting place for educators (specifically psychologists, although anyone is welcome) to discuss issues involving skeptical thinking and ways to introduce and teach skeptical thinking in the classroom.
http://www.sc.maricopa.edu/sbscience/pests/

Skeptic Friends Network
Examines a variety of claims with emphasis on debunking "creation science."
http://www.skepticfriends.org/

Number Watch
Monitors the media in search of misleading numbers in news, politics and science.
http://www.numberwatch.co.uk/

Crank Dot Net
Skeptic provides categorized directory, both alphabetical and hierarchical, to a variety of kooks, cranks, loons, and crackpots on the net.
http://www.crank.net/

Danny's Skeptic Resources List
Features list and highlights of skeptical information available on the web.
http://dannybhoy1.tripod.com

Fortean Times
The Journal of Strange Phenomenae. Online version of the print magazine.
http://www.forteantimes.com/

Carl Sagan's Baloney Detection Kit
Tools for testing arguments and detecting fallacious or fraudulent arguments, based on Sagan's book "The Demon Haunted World: Science as a candle in the dark."
http://www.xenu.net/archive/baloney_detection.html

Astronomical Pseudo-science: A Skeptic's Resource List
A bibliography from the Astronomical Society of the Pacific, for those who want to examine with a skeptical eye some of the claims at the fringes of science that seem connected to astronomy.
http://www.astrosociety.org/education/resources/pseudobib.html

Practical Skepticism
A how-to guide for examining claims and debunking myths, math abuse, and misleading arguments.
http://info-pollution.com/skeptic.htm

TrueAuthority.com
Experts test claims on subjects including dinosaurs, creation/evolution, and cryptozoology.
http://www.trueauthority.com/

Reality Matters
Debunks religion, the origin of God, the Bible, near death experiences and paranormal contacts with spirits.
http://www.realitymatters.com/

Skeptic Report
E-zine featuring writings on skeptical inquiry and critical thinking. Also lists related books and provides links to numerous websites on topics including skepticism, alternative science, creationism, and health fraud.
http://www.skepticreport.com

Skeptical Investigations
Criticism of skepticism, including information about fraud in mainstream science and questioning of the methods and motives of skeptics.
http://www.skepticalinvestigations.org/

What is pseudoscience?
How it differs from science, how to spot it. Junk science, pathological science, quackery and pseudoscientific scams.
http://www.chem1.com/acad/sci/pseudosci.html

Tony Youens
Skeptic articles, information, books from Tony Youens - parapsychology investigations.
http://tonyyouens.com/

BookTalk
Dedicated to the advancement of critical thinking, reason, intelligence, freedom of inquiry, philosophy and the scientific method. Forums include chats with the authors.
http://www.booktalk.org/

The Nasty Side of Organ Transplanting
The secrets of organ harvesting and transplanting known only to the professionals in the business.
http://www.geocities.com/organdonate/

Rational Skeptics Page
Rather odd collection of skepticism-related rants
http://www.geocities.com/xx_rational_xx/

The Skeptic Magazine
United Kingdom publication, taking a skeptical look at pseudoscience and claims of the paranormal.
http://www.skeptic.org.uk/

The Crackpot Page
"Dedicated to all the Flat Earthers, Circle Squarers, Angle Trisecters, Cube Halvers, Perpetual Motion Mechanics, UFO and Elvis sighters, and all the other true believers who adamantly refuse to accept mathematical or physical proof that their convictions are untenable."
http://www.phys.psu.edu/~scalise/misc/crackpot/

Eric's Skeptic Page
A skeptical look at all sorts of sciences and pseudosciences.
http://www.phact.org/e/skeptic/

The Skeptic Tank
The Skeptic Tank is a BBS which maintains extensive archives on scientifically questionable groups, individuals, and ideologies. Message board and articles.
http://www.skeptictank.org/

Massimo's Skeptic and Humanist Web
Addresses the topic of skepticism and secular humanism. Page includes lectures. handouts, and online column. Also, has links to book reviews and essays.
http://www.rationallyspeaking.org/

Skeptix Mailing List
Forum discussion about extraordinary phenomena. Includes post archives and subscription information.
http://www.lists.opn.org/mailman/listinfo/org.opn.lists.skeptix

A Skeptical Manifesto
Article by Michael Shermer defines and discusses skepticism. Includes a section that asserts a skeptic can also be open to scientific reason. Written in 1992.
http://www.skeptic.com/about_us/manifesto.html

X-Project Paranormal Magazine
Web e-zine featuring a series of skeptical articles.
http://www.xprojectmagazine.com/

The View from Number 80
Lists sites pertaining to, amongst other things, pseudoscience, flim-flam or irrational claims and tries to give them critical attention and, in many cases, a certain amount of ridicule.
http://www.number80.co.uk

Skepticality Skeptic and Critical Thought News
Roughly monthly podcast of interviews with prominent skeptical thinkers.
http://skepticality.libsyn.com/rss/

Skepchick
A woman's skeptical science and life weblog.
http://www.skepchick.org/

Skepticality
The official podcast of SKEPTIC magazine. Critical thinking and skeptical analysis of all types of topics, especially ones with scientific and/or supernatural aspects.
http://www.skepticality.com/

Point of Inquiry
The Center for Inquiry’s radio show and podcast. Point of Inquiry explores CFI’s three research areas: pseudoscience and the paranormal, alternative medicine, and religion and secularism.
http://www.pointofinquiry.org/

Logically Critical
Podcast intended to encourage critical thinking in everyday situations using information about which people can reasonably agree.
http://www.logicallycritical.com/

The Skeptic Magazine
Links to news articles of interest.
http://www.livejournal.com/users/ukskeptic/data/rss

NYTimes.com - Odds Are Stacked When Science Tries to Debate Pseudoscience
Essay. Having a debate inevitably suggests that each side has some credibility. As a result, opponents of the scientific method try very hard to appear in debates with scientists.
http://www.phys.cwru.edu/~krauss/nytimesaprilrev.html

Bad Language
A doctoral student presents her investigations into the paranormal and pseudo-scientific, as well as an analysis of linguistic myths.
http://www.bad-language.com/

sci.skeptic FAQ
Frequently asked questions about the sci.skeptic newsgroup.
http://www.faqs.org/faqs/skeptic-faq/

Free Thinkers Blog
Regular articles on scientific evidence against superstition.
http://FreeThinkers.blogtoolkit.com

Nova: Kidnapped by UFOs?
Companion site for TV program in which believers and skeptics, including Carl Sagan, explore case histories of alien abductions.
http://www.pbs.org/wgbh/nova/aliens/

Bad Psychics
Dedicated to exposing claims made by physics/mediums. Includes articles and forum.
http://www.badpsychics.com/