After nearly two years of development, the WCAG Samurai Errata - corrections to the Web Content Accessibility Guidelines (WCAG) 1.0 - were finally released to the web development community three days ago.
The reason for the update is because version 1.0 was originally published back in 1999 and in that time both web browsers and assisting technologies have evolved considerably.
Note that the WCAG Samurai Errata is not a standalone document, you should really use it as an update along the original WCAG 1.0 guidelines.
Also note that there is a Web Content Accessibility Guidelines 2.0 working draft available, lastly updated in December 2007, which you should consider to use over the 1.0 counterpart.
