I saw Todd a few years back after he moved back to Dayton, OH when THQ bought out Volition. We went out to a couple bars and got completely sloshed and I haven't heard from him since. He might still be in the area for all I know.
Alphakiller posts a lot on Something Awful under the name Psion.
Last I heard from Ben/Remora he was moving up to Minneapolis in a neighborhood really close to Kyle (Orange). This was years ago and I don't know if they're both still there or not.
I think Dave Baranec still works at Volition. I remember seeing his bio there when I browsed through their site a few weeks ago. Nathan C does not work there anymore however. Not sure where he ended up.