I think they're planning a fifth Spiderman, but Spiderman 4 is definitely set for a 2011 release.
Also, Shrek Forever After is out next year. And Eclipse is supposedly meant to be out next summer.
I'd say Indiana Jones 5 for 2011 at earliest. Of course, Harry Potter for next winter, and the summer after that.
Erm... Hangover 2 for 2011, I think. Toy Story 3 next summer. Kung Fu Panda 2 in 2011, along with Madagascar 3. Tron Legacy next year.
That's all I got, off the top of my head.
ETA: The Voyage of the Dawn Treader (I think that's the title) is meant to be out next year. They should give up on trying to make that franchise happen.