) on Innerbits talks about how background downloading is implemented in the PlayStation 3. I'd consider this a rumor but the implementation is that background downloading will only be implemented while you are in the Cross Media Bar screen. That means no downloading while playing games like on the Xbox 360. That's the initial release however as Sony has some ways to incorporate background downloading while playing games down the road. Something is better than nothing so look for this in the firmware update 1.60 on your PlayStation 3.