One of my all-time favorite sites for free (and pay) fonts in the vein of comic books & comic-style ads, etc. They also have a substantial selection of 'balloon art' and 'sound effects' in case you're producing your own web comic, or maybe you just want to jazz up those family photos..

Most fonts at Blambot are available in many different formats - Mac TT, Mac Postscript, PC TT, and recently they also began offering OpenType downloads as well...

Here's the latest free font available, "Fire Fight", as of 1/02/08:

Enjoy browsing - I always do!