Would be great if Prezi supported SVG vector images.
There are several reasons SVG is nicer than PDF/SWF vector images:
- SVG is an open standard
- There are many free clipart galleries with SVG images
- Creating SVGs is easy with free tools like Inkscape
- Exporting an SVG as PDF (e.g. from Inkscape) will leave a white non-transparent background upon Prezi-import, and edgy, linearly interpolated curves
- Converting SVG to SWF even with commercial tools (Illustrator with maximum curve quality setting) will distort curves in a sometimes visually disturbing way (especially at a greater zoom level)