Oh man, there's a real hit of nostalgia. I played BZFlag a whole bunch back in middle school and high school, and it was one of the first places where I got involved in the community at all (mostly hanging around some phpbb forums!)

Good times.

I don't remember too much of what I did, but I made a couple of maps one of which was hosted on a server for a week or something. It wasn't especially good, but it was a pretty amazing experience that somebody else thought something I made was good enough to try out, and that I could log into a "real" server and see it in action :P