Nero the creators of easily the best Burning Software have on thier PSP page a load of Movie Trailers for the PSP, heres the list:
Freedomland
Fun With Dick and Jane
Into The Blue
Memoirs of a Geisha
Oliver Twist
Rent
The Exorcism Of Emily Rose
The Fog
The Gospel
The Legend Of Zorro
The Pink Panther
Underworld: Evolution
Zathura