What does this tool do: Soothes your lonely heart…or is very valuable as a niche and ranking tool.
Who Needs It: Do you want to be in close touch with your potential buyers?
Info Page: http://www.meetup.com/
Meetup serves multiple purposes: it will allow you to meet like minded individuals who share your goals and ideals; it will allow you to mix in and eventually rank your own site, and it will help you to prequalify your idea. What good is the last thought? If you need to identify an interest in your area of expertise, this is the place to find it.