It really depends on what I'm doing with it. I use Impact in a lot of my ads, just because of how strong, bold, and eyecatching it is. Cosmos is a good fun font that can be stretched nicely. Boulevard is a great script font. Rosewood is an awesome "I just feel like standing out today" font. I'm using Century Gothic on my website because I love the circular letters.
Dawg4Life, you'd love my Neopets guild page
, it's got Vampiress for the links
I'm surprised that most people like the plain sans-serif or slab-serif fonts as opposed to something more striking. That's kind of unexpected.