There are certainly many places where someone can find free themes but what places have a variety of beautiful free themes and are reliable?
http://www.freepremiumthemes.com/ http://www.problogdesign.com/wordpress/40-free-premium-quality-wordpress-themes/ http://www.hongkiat.com/blog/16-free-premium-wordpress-themes-that-dont-suck/ http://www.site5.com/wordpress-themes/ Source: Google search engine.
You can look some of the best free themes of 2011 here http://www.webdesign2day.com/2012/01/09/20-best-free-wordpress-themes-of-2011.html