I really like Meetup’s homepage. No feature lists, just lots of examples of meetups (which give you an idea of what it’s like), some endorsement quotes, and then a long list of cities and topics. (And a searchbox and featured meetups.)
In other words: let the data speak for itself. Compare with Basecamp’s homepage, where it’s all about benefits (not features) and endorsements. For their service, a good approach too I guess.