Know-How Exchange : E-Marketing

I need to find a lower cost alternative to brainshark that allows me to have viewers register for certain ppts( my choice of either before or after viewing preferably) videos so I get sent emails when viewed. Also all my audio is on mp3 files and synced to the slides. I'm a small operation so brainshark wants much more than I can spend. I like the slide format so viewers can control the presentation. I don't need animation but it could be useful. I need to track viewers so I can email/call to follow up. A drop down during the ppt/video allowing them to request more info in the middle of the presentation would be a plus