"Here is a test presentation of a new slideshare feature I have been waiting for. Combine your slideshare presentations with an audio track and Voila! an audiographic presentation. Voice over PPT - Very effective for rehearsal or for cleaning up and redubbing a previous audio recording of your presentations. Also useful as soundbite creator for selected segments of a presentation. And, all nicely microformatted by Slideshare to support remixing. Could be a new style of podcasting."
Here is the slidecast that Dave was writing about, "Differentiation and Engagement" by Garr Reynolds at Presentation Zen ( kudos on the blog name, Garr !):