The Man in Blue
The Man in Blue: Via StopDesign comes this true XHTML+CSS work of art. Just hit the switch off stylesheets link to see what CSS designs are capable of.
As a final note, probably the most heart-breaking thing about developing in XHTML/CSS is that it comes so close in many areas, but falls just short. Sketchy support for standards means that a semantic Web (purely non-presentational HTML) is a distant pipedream, and that your pages must still be littered with redundant mark-up in order to achieve graphical effects beyond your standard two-column, black-and-white blog. This is particularly true when trying to get something to display correctly in IE 6.0 for PC, which is infinitely buggier than 5.5.