Typedia is a search engine for fonts. It actually is very cool once you get used to the interface. It is similar to most search engines, but it has a wiki-type feel to it as users can add their own fonts to make the "engine" flourish.
One complaint I have is you can only search once every 15 seconds, I'm not really sure what that's all about. Also, on trying a number of fonts, some of the more obscure ones don't show up (ex, Futura).
All in all I find this to be useful search engine and recommend checking it out.
Click here to give Typedia a try.