Although I'm not in exactly the same boat (i.e. I do finish projects but I'm slow), I'd love to be a member of such a group: a mutual accountability forum or weekly lab-meeting where everyone declares what they've done this week.

I know that the Micropreneur Academy has such a forum as one of the attractions, but I think it can be open and free for anyone who's not too worried about their ideas getting pinched (speaking for myself, I wouldn't be worried).