If it could be made to recognize usernames instead of, or in addition to, the numeric profile type, then that'd be cool. I would have hoped that the numeric profile type would have been gone by now. Activating facebook via the cell phone is a struggle though, so it makes sense that there's still some who don't have usernames.
Anyway, just thought I'd mention it. o_o
Your numeric user ID at www.facebook.com, e.g. http://www.facebook.....php?id=XXXXXXX
Edit: Sowwy, I seriously didn't know that the numeric ID still existed after you got a username