[Fzznik]

1. Where's the Login/submit button? I wonder if many people would expect this.

2. What do people think about when you enter your email address and accidentally enter the wrong password: should the next page have whatever email address you initially entered re-displayed? Because the error message (rightfully) doesn't indicate whether the problem was actually with the password or whether you instead typo'ed the email address, would having this re-displayed allow the user to more easily recognize their mistake? (i.e., seeing that you typo'ed your email address is more helpful instead of first thought being that you've forgotten/mistaken your password)???

[peterjmag]

1. Problem is, not everyone will know that they're supposed to hit Enter to submit, so you're already needlessly frustrating a percentage of your users (albeit, probably a small percentage) by hiding the submit button. Here's a bit more discussion on the topic, from a question I asked on UX StackExchange a while back: http://ux.stackexchange.com/questions/8876/usability-of-hidi...

[Stratoscope]

Indeed. I've watched many friends fill in online forms, and I can't remember a single time any of them have ever used the Tab or Enter keys. They've all clicked on every field and finally on the Submit button.