Looking great so far... had a couple of suggestions for the registration page that I've not been able find elsewhere, apologies if already posted.
- Username check to see if the name is free to use, probably more of an issue for communities with a larger member base, but an inline username check would be handy.
- Make the Terms of Service link a thickbox style pop-up that shows the TOS, save taking people to the main help section.
- Easier CAPTCHA images? Took me a couple of refreshes to get one I could type easily, may just be me on this one though!