Converting powerpoint online
you could upload PPT to here - http://www.slideshare.net/ and then get embed code for blog, etc
Checkout all the suggestions from classroom2.0
Powerpoint to the web http://www.classroom20.com/forum/topic/show?id=649749%3ATopic%3A59773
Dont use bullets in MS Powerpoint http://www.slideshare.net/RowanManahan/dodging-bullets-in-presentations
If you are a Google docs user:create a new presentation and import PPT file,Click "Publish" and "Publish Doc" then use code to embed (from @tombarrett)

converting ppt to movies - 5 different ways

Interesting blog using powerpoint and powerpoint presentations.
converting powerpoint to flash movies

Ways to uploadppt for online use