I’ve not seen the DVD, but I’m sure it lives up to the high standards .NN/g adheres to on everything else they do. Basically, it shows techniques for, as the title states, Paper Prototyping.
I can’t attest to the techniques they espouse, but the basic concept is, it seems to me, common sense and I’ve used it for quite a few things. Even if you are just using it for yourself as a way to figure out how to do something, it is a worthwhile technique.
And I’m sure this DVD is well worth the $50 (+ $3 s&h).