SlideShare is a free service for sharing presentations and slideshows. You can upload your PowerPoint (PPT and PPS formats) and OpenOffice (ODP format) presentations, browse other presentations, and comment on individual slides. It’s a great way to share your ideas with others, or to learn from other people.
It’s Power Point + YouTube. Leave a comment on this post and I’ll send you an invite. Offer good while supply last. 
Here’s an example:
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It looks like a cool application. I would like to try it.
Invite sent. c”, )
Thanks!
would like to try it!
please send an invite!
pls send me an invite! thx!