My wife (a physics professor) and I have been considering doing a tutoring service just like this - there's an immense need for it. I'd love to do the development, but we were both at a loss as to how to find an initial set of tutors. Also, how does this differ from other tutoring services out there?

I'd definitely develop it. I just don't know diddly about (the social end of) running it. Anybody interested in that end of it? michael@vivtek.com.