The prospect of "remote play" - whereby you can play select content from your PS3 on your PSP - is an exciting one, but also one that's been sadly under-utilised by Sony and developers. Enter the mod scene.
This is the PS3 Wireless Visual Interface, by techknott. Which allows you to do anything and everything you'd normally do on your PS3 on your PSP.
Sounds amazing, but it's really quite simple; all the device does is stream the PS3's data directly via a 1.2GHz transmitter, which it then replicates on its own screen and speakers. There are compromises to be had doing this, sure, from graphics to poor sound to slight lag, but hey, you want portability, you've always got to be willing to make a trade-off.
What this means is that unlike Sony's official remote play function, which for PS3 games has to be supported by developers, the WVI streams everything. Even Modern Warfare 2.
techknott's - PS3 WVI (youtube video and pics included) [ben heck, via Engadget]