There are three main aspects of Snow Leopard’s Spaces behaviour that I use frequently:
- Creating multiple Spaces (four, in my case) for various purposes.
- Assigning certain apps to always open on a specified Space (and certain other apps to open on all Spaces).
- Switching directly to a given Space using a keyboard shortcut.
All of this functionality remains available on Lion, but some of the settings have changed location.
Spaces still exist in Lion, but they are hidden in Mission Control and you need to move your mouse to the right of the desktop thumbnail row at the top of Mission Control. Only then does the “Add Desktop” button pop up.