Apple - iOS
Official site. Provides information on the current version of the iOS.
Covers hacks, tutorials, tips and tricks, apps, games and news.
Offers application development tutorials, resources, competitions, interviews and code snippets
Mashable - iOS
List of iOS articles in Mashable.
My Apple Gadgets
Reviews of apps and accessories for iPhones and iPads.
User submitted content pertaining to the iOS operating system in the form of text posts and links.
Wikipedia - iOS
Hyperlinked encyclopedia article about iOS with its history of updates, features, development information, list of supported devices and digital rights management.
Download links to present and earlier released versions of iOS firmware.
iOS Version Stats
General demographic overview of iOS versions being used and by what device. Information is updated daily.