I'd say everything I do is about building a community, whether it is around a product, on a website, or in my city. I really see the value in meeting others and figuring out how I can help them. Getting that going and seeing how it affects people's lives is definitely one of the best feelings I know of. 

The community environment is where one starts to see extreme periods of growth. Sharing a wealth of knowledge leads to rapid innovation, sharing the workload leads to individuals being able to take on more - history tells us this is a good thing, we are all not our own islands.

Unfortunately, it would appear that everyone wants something for nothing...and I can't bankroll that attitude :(