Hey MC, the service sounds pretty cool! I'm in the process of learning as much as possible about recognition techniques.

According to the FAQ, you're not performing face detection (you ask users to crop their photos). Did you find that the process was too computationally expensive?

EDIT - after completing the registration process I was given an error page. But the process must've completed, since I can log in and use the site just fine.

I have some additional comments (for instance, when cropping my user photo it'd be nice to see an example of a "good crop" so I know how tightly to focus the box around my face, without having to click through to the guidelines page). Is there an email address I can contact you at?