I read a few days ago an interesting post about what are the best fonts for programmers (monospaced fonts) at Hivelogic. And I decided to try out one of the fonts, Inconsolata. Here you have a screenshot of emacs with it.

I think it looks very similar to my previous favorite, Lucida Console. If you want to set it up in emacs (why would you use any other editor?), just edit your .emacs file and add

(set-default-font "Inconsolata-12")

Or something along those lines, depending on your preferred font size.