Action/Adventure 360 exclusives...

Naruto RIse of a ninja

im not even that interested with the show,but the game looks convincing

To add to the ones posted: Dead Rising, Crackdown, Saints Row, Hitman? (idk if you would call that A/A)

and you meant ones that are out, right?

I tend to think of Crackdown and Dead Rising as action adventure games, but a lot of people give them their own genre, sandbox games.

For a more traditional A/A game, look at Kameo, and Naurto Rise of the Ninja will be out soon, and all the previews say it will be atleast a good game.

Dead Rising

Saints Row

Crackdown

Kameo: Elements of Power

Are the ones that immediately spring to mind. And they are all currently available. And are all good titles.

Coming out:

Mass Effect (an RPG that has action adventure elements)

Alan Wake

Too Human

and a few others I can't think of. Plus all the multiplatform action titles like Assassin's Creed and GTA.