Mozilla has a competition going for open web games with a closing date of 1/11/11. It'd be great promotion for this community if some of us were to get together and develop something fun and light-weight using open web technologies. :-)
You might be able to find people to do that here but I don't think we're going to officially sponsor/sanction anything like that. Unfortunately there isn't really an easy way on-site to coordinate anything like that either since the per-site chatrooms don't seem to be working yet.