It's funny, just about every website you go to sign up on that wants your email address gives you those TWO boxes to fill in. Email and Verify Email. I don't who started this, or why everyone thinks they should follow, but I wish it would stop.
I understand where this malady came from: it was some smart web monkey seeing the Password and Validate Password combo and adopting it. But I don't think they quite understood why this mechanism is needed in that case. Just to be explicit - it is only needed because you can't read what you just typed in in the Password box. For the email address, I can re-read that just fine thanks.
Besides, I figure if you can't either type in your correct email address, or read that is not correct and correct it, then you failed my minimum user requirements. There is a certain limit to how far you need to go holding people's hands.