AS A CUSTOMER, what form do you like to receive your product in?
Video is obviously becoming more an more popular and audio was popular before that, but personally I was like a report. I like being able to scan through all the nonsense a lot of people put in their product as filler or as background information that I already know and get right to the new stuff. Also if I want to go back a double check something it's easier to find.
I also like the instant download of whatever. Mail takes a really long time to get me, which contributes to it. (I'm still waiting to see Kern's Mass Control and I just ordered STSE 2.0 as you can see from my other post.) The exception to this being the hundreds of books I buy off of Amazon on a regular basis.
But those are just my personal preferences. I also know that video, audio, and physical products all raise the perceived value of a product. Just wanted to know what your personal preferences were.