Reverse & repeat an animation in Keynote '09

There is no way directly to get an animation to reverse and loop. However, you can take the slide with the animation you have in Keynote, export it as a QuickTime movie, and then re-import that into Keynote. In the Keynote Inspector, you can then set up the movie to loop back and forth.

One of the options in the QuickTime Inspector is to loop back-and-forth, which automatically reverses the movie at the end, the runs it forward again, and so on. You don't need to add in the reversed part of the movie explicitly.

In the new Keynote that you extracted the animation slide to: go to the Metrics tab of the inspector and select the largest of the text box, shape or picture that is in the animation. It will tell you the exact dimensions of the object. Then go to documents tab of the inspector and at the bottom change the slide size to the appropriate size for the animation. You may have to reposition and resize some things since when you shrink the slide size, it will shrink the objects on the slide. But when you are done the animation will fill the whole slide and the quicktime exported movie will be the same size as the slide was, so it will not cover up anything else on the new slide.

Hope that all makes sense to you, if not I can try to explain a little better (after I have got some of my coffee in me this morning!).