I know this is an old thread, but in case anyone is still wondering.
I´ve had my PS3 for a couple of weeks, and I want a cockpit and G25 so much. I´v really enjoyed playing the Prolouge.
My friend got his PS3 today, and were chatting on MSN about how everything seems to work with the PS3, like old bluetooth keyboards, media streaming and such. Suddenly I get the idea of digging into old equipment, and finally after getting old computer and flightsim yokes, joysticks, and pedals out of the way (my kitten made the process much harder than you would expect) I dug out my old Logitech MOMO Racing Force.
http://www.logitech.com/index.cfm/gaming/pc_gaming/wheels/devices/320&cl=US,EN
It worked!
I just pluged it in, and pedals work, force feedback work (Well! had to tune it down alot), shifters behind the wheel work and two of the buttons on the front work as hand brake and shifting view. No configuration needed.
I haven´t gotten to the other buttons yet, but I get a panel in the GT5P options menu that has options for several Logitech wheels, but not this one. I might get somthing out of trying to choose different profiles, but I got to say I was very pleased with this discovery, and it made my day!