Prezi can be used for mindmaps. However, there is as of yet no quick entry mode for these.
An possible approach would be an import functionality from freemind (http://freemind.sourceforge.net/wiki/ ); its file format is XML, so an import could probably be written real quickly.
It would certainly make me think about importing all my current mindmaps into prezi…
(I wrote this idea as a reply to another subject; as that was already marked ‘closed’, I reposted the idea here).
Kind regards, Roel