Please be aware that beginning on April 2, 2013, logging in to the game or website will require your Display Name. Email addresses will no longer be accepted; your Display Name will be the only accepted option.
I need three pieces of information to log in. My username. My password. My authenticator. You are willing giving one of those away to potentional hackers and the other two are easy to overcome. Wow. Really? This is actually worse than Blizzard's real name on the forums thing.