Douglas Perry over at IGN made a list of the games released since September for the Xbox 360. There were six exclusives (three of them were Burger King games). Here's his list:

• 6 exclusives: Gears of War, Viva Pinata, Dead or Alive Extreme 2, three Burger King games (Sneak King, Big Bumpin', Pocketbike Racer)
• 2 games on Xbox 360 but not PS3: Splinter Cell Double Agent, WWE Smackdown Vs. Raw 2007
• 6 games on Xbox 360 before PS3: F.E.A.R., Rainbow Six: Vegas, Need For Speed Carbon, Marvel Ultimate Alliance, Tony Hawk's Project 8, Call of Duty 3

• Dead or Alive Xtreme 2 won't sell half million copies in the next six months, said Perry, because it's just a "girlfriend simulator" and "soft core niche material."
• Splinter Cell is an "exclusive by default" that was cancelled for PS3 because it couldn't be done on time.
• Tony Hawk, Marvel Ultimate Alliance, and Call of Duty 3, are all sequels ("as dull as you can get," said Perry, "predictable, unoriginal, and franchise material"). It's the third Call of Duty, and the Tony Hawk title is Tony Hawk Project 8 - and it's eight years running - it's got its fans, but that's it. Ultimate Alliance is "the same old Diablo-style button-mashing action-RPG."