Switching Spaces with shortcuts in Lion
Lion reinvented Spaces. It is now not intuitively possible anymore to predefine which apps should run in which Space, but it’s also not possible anymore to switch directly to a specific Space. The shortcut used to be ⌃1 for the first Space for example.
You have to go to System Preferences and open Keyboard → Keyboard Shortcuts. Under Mission Control you should see entries for created Spaces. Just enable them and they are going to be available.