I like browsing Smashing Magazine for themes
100 Excellent Free WordPress Themes
http://www.smashingmagazine.com/2008...dpress-themes/
83 Beautiful Wordpress Themes You (Probably) Haven’t Seen
http://www.smashingmagazine.com/2007...y-havent-seen/
100 Amazing Free Wordpress Themes for 2009
http://www.smashingmagazine.com/2009...emes-for-2009/