How to create an online presentation

With ZohoShow you can create online presentations and either access them online or send them to coworkers, friends or clients.

Some features (from the site):

• Access from anywhere, anytime
  Access, import, edit and share presentations from anywhere and anytime
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• Sharing and Collaboration
  No more emailing around of presentation files. Share your presentations with your friends/colleagues and the shared presentations can be viewed/edited with just a browser.
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• Present from Remote
  Give a presentation to a client who is half a globe away. Do your demos while at your seat.
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• Embedding
  Make your presentations public. Embed them in your blog or website for easy viewing of your readers
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And of course, as is everything mentioned on this blog, it's free (for personal use) once you register.