1001 Free Fonts
Pretty self explanatory. Pay attention to the usage guidelines though. Not all fonts can be used for commercial work. (This is typically true of any site offering free fonts. Make sure you know what you’re downloading.)
17 Top Tips to Create Your Own Typeface
Want to make your own font? Here’s some tips.
Blambot Comic Fonts & Lettering
Need a font that you don’t have? There’s a wide selection here.
Comiccraft Fonts
Another site with a wide selection of professional fonts priced from $29 and up.
Fontifier
I cannot vouch for the quality of this site, but it is apparently an option for turning your own writing into a font.
Font Squirrel
A site offering links to free fonts. As with other free font sites, pay attention to the license for each font just to be safe.
Google Fonts
Is there anything Google doesn’t have?