If you have a Windows PC, you could use these to work alongside your Prezi:
Autoplayer - set each individual path to its own time (video and sound) then loop the Prezi - great for exhibitions (portable Prezi only) - Screensaver as well…
Logo Anywhere - drag your Logo to any part of the Prezi before presenting
Speaker Notes - With a portable Prezi - use Adobe Reader to display your notes on a projector / another screen by using extended screen settings - will auto-turn the PDF pages for you as you present.
ColourStart - open any other file using these colour swf files in your Prezi - uses a text file to open a programme on your local drive (webpage, poll, video etc)
See them all here: http://bit.ly/QaWTVI