I like this not just because it's fun to meet up and hack with other folks, but because it gives people a way to post/discuss/brainstorm ideas. It's always more fun to discuss these things in an open, social setting where the emphasis can be on improving ideas and generating new ones, and can draw people away from the traps of being possessive and defensive about their ideas.

Your main challenge is likely to be getting enough volume on there to keep it interesting. You might try making a dramatically more lightweight way to participate -- a simple "What would you like to build?" prompt where people can type an idea anonymously and other users can vote on the idea, comment on it, or turn it into a proposal.

In general, you need to find a much more concise way to explain how I get involved and what the benefit is than a 150 word "basic concepts" page. Probably there should be a new proposal form that I can see and fill in before registering, and that form should be designed to explain clusterify as I fill it in.