Unfortunately, they not only make the common mistake of referring to an mp3 as a podcast, they're actually using an RSS icon to indicate an mp3.
I keep meaning to do more with Slideshare. It seems like it would be a great way to do tutorials and such. We've got an audio tour in the works that's basically a slideshow with narration even though we're producing it as Quicktime video. I should consider doing a Slideshare version.