Thanks, DK. I used Voice Thread. I did this through my university, but I believe anyone can get a free cloud-based account that allows you to create and share content. I used PowerPoint to create the slides and then did a voice-over using a cheap headset headphone/mike combo. I did the same for a mock introductory lecture to one of my legal studies courses except that I used a modified version of just a couple of slides similar to what I would use in my class lectures and then recorded a video right from my laptop camera and built-in mike. Two things I don't like about this solution is 1. there is no way to save a complete file--you must give others the link to the proprietary site if you want to share the presentation, and 2. there are no editing tools. If you make a mistake 10 minutes into an 11 minute presentation you must start over.For these reasons, I will be unlikely to use the site for my professional presentations.
You can do the same thing simply using Powerpoint or a similar presentation package and creating videos separately that you can edit and change with much greater flexibility--it just takes a lot more work. But you get to keep the result in your own computer and share it any way you like, including through YouTube, etc. I did my first effort at a very simple book trailer that includes nothing more than covers from my short-story books with very little information that plays while I narrate my shortest short story (Justice) from my Mindscapes collection. It was fun and useful to experiment with both of these different ways of doing the same thing. Eventually I will port my law for the Entrepreneur course to an online format and that will be a LOT, L-O-T of work just to do completely new presentations and break each lecture into manageable chunks with audio, video, links, etc.
You can do a little more research at voicethread.com. Enjoy!