One of the main lessons from open collaboration projects is that for people to work together you need to break the work down into managable chunks, or work packages. Here are some big chunks that would be conventional parts of a project:
Research
Events
Managing this site
Developing a "dashboard" ... that is, creating a start page using iGoogle, Netvibes, Pageflakes that would pull feeds together from different places.
Developing a membership game based on these games
Update:
Products and services
What do we have already that's a mix of free and paid for
Any format, guidelines needed to invite others to put stuff into the exchange? How do we creat a market place (simply)?