I just started using Prezi after a long time in the PowerPoint dungeon, and while I love the "cool factor" of Prezi, I would ask that you add more tools, options and type styles for users to get the most out of their presentations:
1) Ability to Bold, Italicize, Underline, etc.
2) Ability to adjust line spacing
3) Being able to choose sizes exactly — even if you can't adjust font sizes in the traditional way (12pt, etc.), how about a "snap to" option so that all the selected type blocks are formatted the same size?
4) How about an ability to automatically align objects and type areas
5) More list options: numbered lists, different bullet options
6) Being able to set multiple type sizes in a single type area
Almost every single one of these suggestions is currently available in PowerPoint and nearly every other program that allows even basic word processing. I would love to see them added to your to-do list for Prezi.