Don't recall where the tutorial is, but its fairly simple to create that effect, so here's a quick explanation:
1. First, increase the Scale of your layer using the Animation Controls. You need the layer to be bigger than the actual frame, so you have room to shake it.
2. Then, randomly jump to various frames and adjust the position of the layer, making sure its edges always stay outside of the frame. The Tweening system will take care of the frames in between, and you are good to go.
EDIT: This might be the one you were remembering.
Last edited Tue, 13th Apr 2010, 12:22am; edited 1 times in total.