CodingHorror has some discussion on this:

http://www.codinghorror.com/blog/archives/000157.html

http://www.codinghorror.com/blog/archives/000969.html

Personally, I used ProFont (http://www.tobias-jung.de/seekingprofont/index.html) for awhile, but when I got a new computer I forgot about it and reverted back to Monaco.