Prezi is a Flash-based online presentation maker that doesn't believe all slides are the same. Prezi allows creators to zoom in, slide over, play videos, animate, and do other eye-catching stuff with your information.
It's hard to capture exactly what a difference custom zooming and framing have on a presentation until you see it yourself. Prezi, unfortunately, doesn't offer embedding of its hosted presentations (at least with its free licence), but anyone can check out Prezi's showcased works to see what the deal is about. Editing itself is done with a neat wheel/cog corner tool and a drag-and-drop grid background. The site offers a lot of tutorial videos and demonstrations, like this nice overview of editing and presentation:
Even a free account gets an offline player to use, which is a big plus, and upgrading to "Enjoy" or "Pro" accounts for €39 or €119 grants access to "Private Prezi," upgrades your Prezi.com storage space, and removes Prezi's logo from your presentations. It's similar to Microsoft's very protoype-level pptPlex, but with a refined interface and pretty impressive looks. Free to use, requires a sign-up and email activation. Prezi [via TechCrunch]