Your email signature, that bit of text that's automatically added at the end of all of your messages, says a lot about you. If you're a minimalist, you probably don't have one, which means that you're assuming that everyone you write to knows who you are, what you do, and how to contact you. If you're an over-the-top type, then everyone knows way too much about you, like your three other email addresses and the fact that you dig Yoda quotes.
So where's the happy medium? Scott Hanselman recommends resisting the urge to add logos or photos to your sig, and Geek with Laptop adds that the more stuff you have in your signature, the lower on the corporate food chain you seem to be. (In fact, he suggests going just with a name and phone number.)
I'd suggest a more minimalist signature to your work email, too, but suggest that your title and email address should go in there somewhere as well. And I'm warming up to the suggestion from Email Overloaded to help set reply expectations by including the line, "I reply to most messages within 24 hours."
What do you think? Do you get annoyed by souped-up signatures, or is more information better?