Slideboom and iSpring

I recently learned about Slideboom.com which is a website that converts PowerPoint files into flash movies which means they retain audio, video, and animations. This is quite an improvement over Slideshare.com which only retains the basic slide layout.

I also learned about iSpring which is a plugin for PowerPoint that allows you to convert to Slideboom right from the PowerPoint software as well as to easily integrate flash elements into your presentation.

What tools do you use to share your presentations?