Rainer and OpenSolaris
I got involved in the OpenSolaris project pretty near as soon as I could, back when the website first went public. I soon found a fit in the documentation community where I became a Core Contributor. While my activity has, out of necessity, slowed down, I am still trying to do what I can.

More recently, I've been involved with the SysAdmin group as well. Since this is what I was, the group was a natural fit.

The two groups actually have a good overlap, as sysadmins need good docs, and docs writers need sysadmin feedback. I've gotten to know some great people through my involvement in the community.