If we wanted to create a “project” as a group, I would suggest a few things. Identify and analyze the core contributors. Have a good, simple, efficient way to handle promotion and demotion of core contributors. Have small scheduled meetings for those core contributors. Basically, scrum, as far as I understand it.

http://en.wikipedia.org/wiki/Scrum_(development)

Personally, I would love to play with the Push Button Engine ( http://pushbuttonengine.com/ ) in such a project, in part because it should be easy to share over the internet, a free engine, and things built for the game could be sold by their creators at some point. Unfortunately I don’t have the time to fully run such a project, or I would offer.

However, I do have another idea. Edubacon.com is a WordPress multi-user site with domain mapping as an option. I think I could run a project through that, if others are willing to help out at the project management level. With my views on how good game design is good user experience design and thus good for education and learning, I see no problem doing it as part of the Edubacon efforts. Education and learning could also give a good set of challenges and a different way to approach game design.

Whether forum, blog or other tool, I would suggest choosing one that you are familiar with and easily able to adapt as needed, or have somebody dedicated to running it for you. I know that there are ways to bring blogs, wikis and forums together. Updates through e-mail and feed readers would also be a good idea. I like the idea of a blog just for the ease of participating for the passer-by. Add to that the potential depth of interaction for those interested and I think it makes for a decent combination.