About a year ago there was some discussion of breakup of transitions in Keynote when displayed with a projector, using older model dual-USB iBooks. I had this problem on my 600MHz iBook, and although the transitions looked find on the iBook, there was severe break-up and "stuttering" when I projected the image. I recently tried it again, and the problem has resolved completely! I am not sure why, but I suspect that it had to due with either the update of Keynote or the update of Quicktime, both of which are free. For your information, I am running keynote version 1.1, and Quicktime version 6.3. If you are having problems, you might want to try upgrading. Good luck! David Linker