i went to connect my psp to a promo set at comics connection using the usb cable.Yep through the USB cable...it can only Play songs and upload files....Other than that it cannot sync with the PS3....If you wanna synchronise maybe its only possible thru Wireless Routers in your Home...But the only avalibility is through the WPA(AES) Key....
it recognised my psp, but i could onli play songs, videos, and pics from my psp. i couldnt do anything else