This font is installed by default on OS X. It is big and very easy to read.
|Code Editor using Monaco|
I've been using this font for years. It is a little smaller than other fonts at the same point size.
|Code Editor using Inconsolata|
Source Code Pro
Adobe just released this font and it is very nice. I'm going to try using it for a while.
|Code Editor with SourceCodePro|
This is the first alternative font I used. I think the other mentioned here are nicer.
What do you use?
There are dozens of other great programming fonts. What is your favorite?