Assassins Creed 2, Uncharted 2, CoD4, NFS: Most Wanted, Burnout Paradise, Batman: Arkham Asylum, LittleBigPlanet.
Above are my 7 fave games(not in order). You have no idea how glad I am that 3 of them are getting a firm sequel :p Shame about MW2 though, and the fact that IW won't be making a MW3(at least under Activision)
AC2 had one of the most amazing game engines ever, and put together w/ a great story line it was an excellent game. What concerns me however, is that they've already spoken about there being a Multiplayer. While some of you may read this and think, "OH cool dude!", I am disappointed. This means they will either spend all their time on a multiplayer part of the game that(let's be honest) no-one is going to play longer than a few hours, or that it will be thrown in in a very much pre-release stage, purely to get more sales. If they did the first of the above, the Single Player experience will doubtfully be as good as AC2's. If the second, they are being pushed just like IW were w/ MW2 by Activision - and look what happened there - PC users lost their dedicated servers purely because Activision wanted to charge them for DLC and have a little extra cash.
I don't like talk of MP in a SP game, and that above explains fully why.