So I come to polycount and 3Dtotal when I want to look at great looking 3D art, but where can I go to look at ui and hud designs, preferably for games.

Haven't found any forums like that either, probably because their discipline doesn't have as fixed a set of problems as 3D artists have.. Generally I end up looking at the games themselves for reference.

Here are some game UI artist folios-
http://www.benoitperreault.com/
http://www.youtube.com/gildervyse
http://resume.actionscriptartist.com/portfolio.html
http://www.behance.net/jesh
http://robsugama.com/5599/games