One of the things that was a bit annoying at first about Mac OS X Lion is that Spaces and Expose were integrated into Mission Control. I like the changes overall, as it brings the best of both together in one place, but they also changed the location of some features I liked to use in Spaces.
In fact, they changed the location of these features so significantly that it is almost impossible to figure out on your own, without having to spend more than a few minutes (a critical usability problem, in my view).
I just found this article which outlines the changes made and how to access the old features in Spaces you may have liked but which aren’t immediately evident in Mission Control. Here it is in case it’s helpful to you as well.