Animated GIFs seriously it's a pain converting things to SWF particularly as you have to deal with issues such as the frame rate and when you've got about 30 odd GIFs you want to show it's a real pain in the ass.
Thank you very much for for this idea, we really appreciate your feedback.
We are constantly improving our tool and our knowledge base, so this is really helpful and I have added this request to our list. One of our major goals is to make Prezi a better tool for our users. We're working to achieve this but can't promise anything now.