Here's a great page with a roundup of programmer fonts:
http://www.lowing.org/fonts/

Other resources

Consolas (Microsoft)
Inconsolata
Revisiting Programming Fonts

Here's my shortlist of fave fonts for editing source code. Some of these are built in to MS Windows, others were supplied with Corel Draw 8 (my favorite illustration tool.)

I prefer monospaced, but some times I switch to a proportional font for variety - modern editors do a pretty decent job of dealing with them.read more »