You can use the Powerpoint Slideshow plugin to embed an uploaded PowerPoint slideshow into your pages.
While you are editing a page, choose the Insert Plugin button from the editor toolbar.
Then choose the Powerpoint Slideshow applet.
You can create Powerpoint Slideshows (.ppt files) and upload them to Slideshare.net using the "Launch" link in the plugin applet. If you don't have Microsoft's Powerpoint to create slideshows, you can always download the free Open Office suite which includes an application called "Present". Present allows you to do everything that MS Powerpoint does.
Once you've uploaded your PPT (Powerpoint file), you can grab the embed code from Slideshare and paste it into our plugin.
I uploaded a PPT file to Slideshare and then I copied the embed code. I pasted the code into the plugin and here's the result.