OpenID

OpenID - An open and decentralized identity system, designed "not to crumble if one company turns evil or goes out of business". Official site, with description, specifications, documentation, and resources.
DokuWiki OpenID Plugin - Plugin to allow users to log in using OpenID. Includes description and download.
I want my OpenID - The community marketing site. Includes background information, mailing lists, and forums.
MyOpenID - Secure OpenID provider. Includes background information and online signup.
OpenID Enabled - Provides resources for users and developers.
Sam Ruby: OpenID for non-SuperUsers - Weblog article explaining how the technically minded can set up their own OpenID identity.
Wikipedia: OpenID - Encyclopedia article, with description, technical details, adoption progress, and criticisms.
ZDNet: The case for OpenID - News article by Phil Becker and Eric Norlin outlining the advantages of the system. (December 4, 2006)