A bunch of us are playing Sub Rosa, which was one of the 7-Day FPS games, right now. It's about agents pursuing cars across a city, and attempting to intercept couriers as they race about. You can download the demo here for Linux, Mac, and PC. There's only one dedicated server up, but it looks like starting a new one is pretty straightforward if anyone wants to do that. No one seems to know how to play. So that's interesting. I think you have to get the package and take it to the building marked with a ring of your team's colour. That seems to be it. Hmm.