1) Do you plan on sticking with username vs email address for login?
2) Are you planning on nice URL's for profiles example:
I think this is very important for profile centric social communities, especially if you are hoping that people will use their profiles to promote themselves. All the current platforms provide this so I'm just curious. I only just realized today that this is missing here thus far. The new phpfox v2 even allows someone to change their username (limited to once or a configurable amount of times - or by admin approval only).