Slideboom is a new service for sharing powerpoint presentations on the web for free. Slideboom converts your presentations to Flash movies immediately when you upload.
Slideboom presentations can be shared with your visitors if you have a blog or site. It also has some social networking flavor like finding people with same interest and commenting and rating others presentations etc.
There is a iSpring add-on (.ppt to .swf converter) for Microsoft Office 2008, using that users can publish powerpoint presentations to the web in one click. The converter keeps animations, audio and video in your presentations, so you won’t loose the presentation concept. The add-on is quite useful if you want to convert powerpoint presentations to Flash movies.