Sony plans to release software to allow players to connect their PSP system to a PS3, in order for said player to make use of their DualShock 3 controller.

The functionality will make its first appearance with the release of Resistance: Retribution for the PSP, which gives players the opportunity to play the game with the DualShock 3, not only using the dual-analog sticks, but rumble as well.

It’s not yet clear whether you then play the game via the PS3 on your TV, or you simply, somehow, use the PSP for visuals (wouldn’t you need a stand to hold the PSP?).

UPDATE: It appears as though you’ll be able to play both on your TV and on the PSP… just prop it up… More information is also available on the interconnectivity between Resistance: Retribution and Resistance 2, n the US PlayStation blog.