Awesome! Glad to be one of the first members... I think right now it makes sense to have a pretty broad singular community due to the small userbase, but eventually I'm sure there will be a lot more specific branch off communities. I was planning on setting something up myself but ya beat me to it! Perhaps I'll be competition in the future...

Anyway, I know a bit about communities but not as an owner/moderator. I've just played around a bit in beta. The big difference is in content sorting. You can now post into a community without it being posted into your actual "blog." I think that's great for interaction as now it's more reasonable to pop into a community to pose a question or start a conversation that you might not have thrown into the wild as a "post."

beta.steempeak.com actually has communities looking sweet! And they're pioneering some features that I love! There's a cross posting feature that's similar to a "resteem with comment" idea I've clamored for for years! (I clamor pretty quietly though...)

Basically you can share a post into a community. I've gotta play around but it looks like it can be yours or someone elses, and it can even be past payout. This creates a new post showcasing the post you shared, and that original author gets 90% of the rewards, the sharer gets 5%, and the community gets 5%! Now posts past 7 days can keep earning if they keep getting shared around! YAY!