Something else I forgot - the CAPTCHA that displays those near-impossible-to-read words to make sure that you are a human and not a machine trying to guess logins?
Not gone completely, but at least updated. Most of the time you just need to check a box and it can tell that you are legit without having to enter anything.
BTW: I've updated the new site so you should be able to signin with the username in place of the email. This will be removed at some point once people have had a chance to update their email address.