Here are 5  of my favorite places to look for free fonts.

http://www.dafont.com/
Dafont is a great website because of the amount of fonts available. I’m always checking out their top 100.

http://www.josbuivenga.demon.nl/
Within Jos Buivenga’s exljbris Font Foundry, you will find some of the nicest looking free fonts ever released, these are all must haves.

http://www.fontspace.com/popular/fonts
Font Space has a lot of free fonts and includes previews of every variation, so that you know what you are getting.

http://www.abstractfonts.com/
Another large collection of fonts.

http://en.fontreactor.com/
This might not be the prettiest of the bunch, but it has many fonts to offer.