The unlocks include skins/teams for Socom 3, Jak Racing, Socom FTB and Daxter. To get the unlock goodness, you must open the web browser within Wipeout Pure, go to downloads, and then secret packs where you enter in the codes. Thanks to AsunaNegi for the heads up with the button combos.
Socom 3 Pack: Cross, Triangle, Circle, Square<
Jak racing pack: Square, Cross, Triangle, Circle
Socom fire team bravo pack: Triangle, Circle, Square, Cross
Daxter pack: Circle, Square, Cross, Triangle