The closest I can think of is Bolo.
For those of you interested
www.subspace.net (no, it doesn't run on VPC. Some problem with emulating the network protocals... Anyone try it on VPC for OS X yet?)
I actually bought a $75 PC just to play the damn game. Is that pathetic, or what?
I guess the closest non-networked game is Escape Velocity. Although, if EV were networked it'd kick the sh*t outta Subspace.