More information on the MSN Homepage redesign.
One of the developers on our team (Danboe) has a list of articles about how we went about converting the MSN Homepage to XHTML. It is a very interesting read. You can find them at:
Part 1: Valid XHTML 1.0 Transitional
Part 3: Consistently Interpreted CSS
Part 4: Onwards to XHTML Strict
-Venkat