A few weeks ago, an article was published on Smashing Magazine 10 Ways To Make Your XHTML Site Accessible Using Web Standards.
The article drew well over 150 comments, including much criticism from web accessibility experts such as Jared, Patrick Louke, Joe Dolson, and yours truly.
As Andy points out in comment 17, a web page can be 100% XHTML Strict (or standards-compliant) but not be accessible.
In comment 41, the “some random ten things one can do to be more of a web standardista, per se”
In comment 29, Jared list several