That's pretty neat. The suggestion tooltip in it's current form is a bit annoying though. I actually did type my email correctly, it even has a gravatar, but I can't stop the suggestion from overlaying half the password field.
Also, on a failed login attempt I usually typed my password incorrectly, not my email (especially when I can even see my gravatar). So you might want to keep the email field populated.
Also, on a failed login attempt I usually typed my password incorrectly, not my email (especially when I can even see my gravatar). So you might want to keep the email field populated.