Rumors suggest that the PSP may be able to use its Wi-Fi capabilities to control the PS3:
?However, you will be able to use your PSP’s Wi-Fi capability to play movies and flick through all of the files and folders on your PS3 from the comfort of your sofa. And since the two machines will also share Memory Stick Duo cards, you will be able to transfer photos and films between the devices.?
This could also mean that the PSP could be used to transfer UMD movies to the PS3 to view on larger screens, which would definately boost UMD sales. No actual details are available.
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