After nearly 8 years in development, the Web Content Accessibility Guidelines has been finalized and has reached recommendation status. Congratulations to the working group on this accomplishment. Read the press release. For entertainment, go back and read the initial, January 2001 version of the guidelines to see how the guidelines have dramatically changed (and for the better) over time.
Look forward to more detailed analysis and resources on WCAG 2.0 on the WebAIM site in the near future.