The real value that a community like this could provide is the creation of what Justin calls mastermind groups. It reminds me of Sprouter.com but on a much more personal level. The latter is very important in my opinion. Starting a business is something you experience on a very personal level and these groups could provide the help/advice (and possibly support) that a (new) entrepreneur needs to succeed. I do wonder what the "mentors" gain from this time investment.
I like most of the idea and am looking forward to how it grows and develops.