I ran into trouble with Prezi. I was unable to load images, video or pdf's from my pc into it, it seems to be a network permission problem again. I spent a long time trying to get this to work, and trying out the functionality with what I fell is very little to show at the end of it. I think more info. on how to get started etc, would be useful on the prezi site.
However it looks vey good, and I have drafted 3 prezi's. You can see one of them at:
I think that the introduction videos could be paced a little slower, but over all this is a very useful tool.We have imindmap at work so some of the same use could be made in one or the other.