Sometimes, when I've found a great presentation that I'd like to share with students or teachers, the only option seems to be to point them to the site with the PowerPoint download link.
Unfortunately, this means a less-than-ideal browsing experience that forces the viewer to leave Firefox, download the PPT, and open a separate application in order to view the content. Just the other day I was reminded of the power of Google Docs viewer.
Google has provided a nice little page that will let you paste in the URL of the PPT in question, and the form generates an email link, a snippet of html to paste the link into a webpage, and the embed code to place the slide show into an existing webpage or blog post.
Check it out: this is a handy little tool!