DivX.com, and then find a product registration code from your PS3, and then download a file to a flash drive to copy onto your PS3, and then use said file to initiate an activation process ... you'll be able to download one of these movies for free: Ace Ventura: Pet Detective, Two Weeks Notice, The Sisterhood of the Traveling Pants, Batman Begins and Green Lantern: First Flight.
Yeah that's a lot of hoops to jump through just to get to a collection of mostly outdated films. You might be better off saving your time by going to the PlayStation Store and renting something from there instead.
[Thanks, Davis F.! Via EL33TONLINE]