I’m adding a new article to the “Articles” section of this site. This article from Zeldman.com discusses XHTML 2’s few benefits and many pitfalls.
This [switching to XHTML 2] would be a big deal if everyone in the web business was itching to use XHTML 2. But aside from a few academics and XML geeks, nobody we know is in a hurry to use an unfinished, unsupported markup spec that abandons familiar methods to achieve unknown benefits. Web designers have been slow to adopt even technologies that provide clear benefits and are known to work well, like CSS1.