I first came across Prezi late last year when I saw a presentation created using it when it was beta. I applied for a beta account and heard nothing back from them, so it was with some surprise that I "refound" it today. But after playing with it for 30 minutes or so, I really like it and will be introducing staff and students to it in the near future. Here's my first effort - haven't found the embed capability yet (might not be there ... at least in the free version). Must check out the different options in the pay category.