http://www.derbauer.de/ <- first to do 3d flash
http://eyeball-design.com/filenotfound.php <- nifty interfaces
http://www.halfproject.com/ (always coming soon but some great art when they are up)
http://www.neostream.com/ <- great character
http://www.gric.at/ great art and design
So many of these sites die so fast, it seems like only the oldest ones actually hang around anymore.