Looks like this feature is either hidden somewhere in the depths of firmware 3.01 or just delayed. The image below came from the Uncharted 2 European Multiplayer Beta terms and conditions page.

Going to ps3reporting.com will forward you to uk.playstation.com/support right now. So there may be some truth to this. Hopefully we’ll find out soon.

Good Grief: Rep System and More On the PS3