What's with sites that ask people to type in their email address twice? It's not like a password field, where presumably you're typing something you can't see, and it's not like people will enter it twice manually…sane people will type it once and cut/paste the second time.
(Of course, if I designed sites for myself, there would also only be one password field. But that's because I cut and paste my passwords, rather than enter by hand. :-))