Three Finger Gesture on 2007-2008 Macbook Pros Is the three finger gesture supported for the 2007-2008 nonunibody macbook pros? Wondering if I can change spaces on Mountain Lion.
No, sorry. 

See this: Are non-unibody macbook pros capable of lion's 3 and 4 finger multi-though gestures?

And this: Pinch to zoom on macbook pro 2007

If you would like to use these gestures you can buy a magic trackpad or magic mouse from Apple.