We are gathered here today to set the record straight once and for all. You simply cannot run Gears of War on the PlayStation 3.
Can't happen. No way. It would take the army of people at Epic (you know, that actually made the game) months and potentially millions of dollars to port it over to the PS3; as it's a completely different architecture. Some jerk at home with a camcorder is not going to beat Epic to a PS3 port and make Microsoft cry tears of non-exclusivity.
That said, Gears of War actually does run on every other console, though. You just need the right kind of mod. Please watch closely at the step-by-step instructions in this special report.