Yesterday we launched our version of the OBS site. It's not going win any awards, but it was a very interesting learning exercise. I learn't to hate MS IE even more than before, but I did find some useful sites with xhtml/css hints*.
At the moment it's in the snagging stage, I know there are issues on IE, but as IE doesn't run all that well on Debian... I'm not in a position to test it much. Seems okay in Opera and Firefox, works in Lynx, and looks okay in IE6 (from work), so that seemed to be enough to go live with.
* In case you are interested: