I really like Anonymous Pro and use it most of the time on my OS X machines. When not using Anonymous Pro, I also really like Adobe's Source Code Pro (free, and even on GitHub):

http://blogs.adobe.com/typblography/2012/09/source-code-pro.... https://github.com/adobe/source-code-pro

And on Windows? Either Anonymous Pro or Consolas. Having nice fonts for coding just feels so good. :)