I’ve spent the last few days upgrading this site to valid XHTML 1.0 transitional. Molly Holzschlag gives a good overview and background of XHTML in this interview. The benefits of XHTML include increased interoperability and greater accessibility. Though some older browsers do not fully support XHTML, the text of this site is still accessible. See J. Zeldman’s “Why Don’t You Code for Netscape?” and “To Hell with Bad Browsers,” two good rants on standards from a designer’s point of view.