ahh, this is pretty simple.

This deals with Keyframes and the MOTION effect (You atutomatically have this on a clip)

Just choose the clip that you want, select the motion effect. Before adjusting anything, add a keyframe where you want the zooming to start. then find where you want the zoom to stop. where you want the clip to stop zooming, adjust the scale so that it gets closer. (It will automatically add a keyframe)

If you still do not understand, here is a little tutorial on what i did.
http://www.yousendit.com/transfer.ph...72EDDA63EA2EE5
P.S:Sorry if the quality is bad. Wasnt really taking that into consideration.