(going offtopic) Seems everyone has a different taste. I prefer medium-weight fonts, Courier is way too light for me. Do you work on a Mac BTW? I think there might be some massive rendering difference between Macs and other OSes. You can tell by reading people's blogs. Some authors use super narrow, gray-on-white font, which is generally unreadable on Windows, but I think it may look just fine on macbooks.

Personally, depending on editor (each editor has slightly different rendering, spacing, interline etc.), I'm using DejaVu Sans Mono or Lucida Console.

I dislike Consolas, because it's too blurry for me; so much that I generally immediately delete it from my OS installation, in order for it to not show up when I'm reading coding blogs.