Here are a list of websites where you can download free wordpress templates.

http://wordpress.org/extend/themes/

http://wordpressthemesbase.com/

http://wordpresstemplates.name/

http://wordpressthemesforfree.com/

http://www.smashingmagazine.com/2008/01/08/100-excellent-free-high-quality-wordpress-themes/

http://www.wicked-wordpress-themes.com/

http://www.templatesbrowser.com/wordpress-themes/

http://www.nattywp.com/