OCR A was always nice but a bit too "sharp" for my taste.
I used Fixedsys for a while in the past.
Nowadays it's either Bitstream Vera Sans Mono or Consolas.
I use 12 pt. Meera (goodness, 10 pt. Meera would be hard to see, what a typo). It's not a fixed-width font, but it's nice on the eyes, and most importantly, I can read it. :)
@chrisname
You don't seriously expect any of us to believe that, do you? Honestly, though, I was waiting for someone to say it.