Making your Site Accessible: 10 Tips to improve your sites [webmasterworld.com]
CSS: widths and positions: Web Content Accessibility Guidelines 1.0 [webmasterworld.com]
Is there a meta tag for Accessibility [webmasterworld.com]
Is an accessible website a profitable one? [webmasterworld.com]
How to test CSS in aural, Braille and speech [webmasterworld.com]
Accessibility Issues In The Real World [webmasterworld.com]
There is also the forum charter [webmasterworld.com] and library [webmasterworld.com] which will hold these and other useful links. :)
And a classic accessibility thread: