I know, I know; a home theater PC barely counts as a gaming PC, but in the case of HardOCP forum member Achron's sexy metal creation I'm willing to make an exception. Warning: machining porn inside.
I was already interested in Dr. Chris Hazard's complex time travel war video game when he mentioned the military was interested in it as well.
In the first mission of the upcoming computer game that Chris Hazard, PhD, has been trying to make since 1999, our hero, a man named Holloway meets himself.
A couple of years ago, I saw an amazing demonstration of a real-time strategy game that involved time travel.