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/