There are several place that you can upload PowerPoint to for viewing online. One of my favourites is Slideshare. Some of the ways it can be used:

  1. instructional tutorials

  2. Publishing student's work

  3. Hyperlinked homework guide

  4. Introduction to a topic

Then there is Slideboom

If you have made a slideshow with effects, Slideboom will publish with the effects intact


Save your PowerPoint or Keynotes as Pictures and then show off in Cooliris

It is a free download and will add an icon to your toolbar Screen_shot_2010-04-13_at_2.26.38_PM.png

Upload your slides to Flickr or Picasa and then use this site http://www.cooliris.com/yoursite/express/ to embed your Cooliris presentation in your wiki or blog.