Droid Sans Mono looks beautiful. The only disadvantage is that there's no italics or bold.

Feels very easy to read code, even in a very small px (like 10 or 9). Letters are slightly separated, l (ell) and 1 are different, " (opening and closing quote) is straight and not angled, and the "Zero Slashed" version makes it an excellent font for coding.

Very easy to scan through code. Large character size for fonts of the same type size.