Apple iWork '08 - Manual (Page 120)

120 Chapter 3 Getting Started with Keynote
Moving Objects on a Slide
In addition to moving objects on or off a slide, you can move objects from one position
on a slide to another—along a custom path—using action builds.
Add another path to the
object’s movement.
Change the path from
straight to curved,
or vice versa.
Select a path on the canvas
and click here to see a
preview of the action.
Increase, decrease, or
maintain the object’s speed.
Choose Move.