One of the reasons that I've never liked video or audio as a way of receiving or passing on info is due to the inability to jump to the relevant sections (especially when you want to refer back to something).

I came across VeoTag today after seeing it on Guy Kawasaki's blog. It looks like a really nice way of tagging both video and audio.

Have a look at veotag.com to see if you can make use of it at all.