Smashing Magazine shows some superb Wordpress themes. All of them are free. You can find even more themes in their earlier posts 83 Beautiful Wordpress Themes and in Arpit Jacob’s Top Ten Best Free Wordpress Themes And Templates.
The guys over Xyberneticos.com have collected over 2400 Wordpress Themes, packed them in a .zip-file (251 Mb!) and offered them for free download. Impressive, really.
I am green with envy...now its time to move to Wordpress.
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