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Identifont which asks you a few questions and then tries to identify your font. It also will show you a sample of a font when you know it's name, but have no idea what it looks like.
You can also try WhatTheFont?!, which attempts to identify a font through an uploaded sample. The more characters you can provide, the more accurate the guess.
Have a font in your head but can't identify it? Try this site: »typenav.fontshop.com/