Conversation

Do not underestimate the value of 'soft' skills! Even in groups that do tech work like software development having people whose primary skills have nothing to do with software is important.
One hacker space I went to for a bit was mostly held together by a kid who came in and didn't know anything about what people were doing, they just liked to sit there and watch and talk to people as they worked.
Without them I think that the space would have fallen apart.

People like that are very important.