I need to implement some WCAG 2.0 guidelines into a Joomla webpage. I've read a lot about this guidelines on W3C, but the problem is that I really don't know where to start. Please help!
I'd suggest starting by looking at Drupal's example - http://drupal.org/about/accessibility
Probably most interesting would be the issue queue: http://drupal.org/project/issues/search/drupal?issue_tags=accessibility
It's a big challenge. Best to work with others in the Joomla community as there are no quick fixes.