The Lounge is rated PG. If you're about to post something you wouldn't want your
kid sister to read then don't post it. No flame wars, no abusive conduct, no programming
questions and please don't post ads.
For anything except source code: Arial (Helvetica). I think serifs are the typeface equivalent of training wheels, and about as useful as tits on a boar.
Source code: Consolas. I switch back and forth occasionally between Courier New and Consolas. Let the "Oh, that's so old school! I use 'Gorgenfragits Light with a Twist of Lemon', and it's perfect for coding" discussions begin.
I thought Comic Sans was cute, until I found that one of the asshats I deal with in the home office uses it. Uses it as the default font in all his e-mails, including those sent outside the company. In blue.