That's one I beleive I got from 3DAGE. I was wondering how to do a shot with the camera going from behind an escaping hoover biker, to the cops on hoover bikes seeing him coming their way. 

But I have had some odd, yet consistent issues with tweeners and cameras. As in quit often rather then going from back to left 90, it goes right 270. So often you have to add keyframes to make sure the camera is tweening in the right direction, or not zooming out then back in while tweening.