Today I'm playing with Brain Shark a free tool that allows you to take your PowerPoint slides and put them on the internet. You can add audio via phone or use a microphone (I used an Audio Technica 2100 which is only $37 and plugs in via USB or with a mixer). This tool then allows you to see how far people made it through your video. You can add links to websites, social media, or have downloadable files in your presentation as well. Best of all it's free. If you want to publish your PowerPoint to youtube, this is a free way to do it. Want to promote your presentation, it even generates a QR code for you.
Check it out at brainshark.com