As luck would have it, there is now a startup called prodcast! If you arrived here looking for http://prodca.st/, please feel to mosey on over there and have a look around!
Prodcast is a website where you can comment on the products you love and share them with your friends on Facebook and Twitter.
To me, I believe that a Prodcast (if we must have another word for it) is something akin to a product demonstration delivered using the same technologies as a blogcast (i.e. a mix of audio and video).
Comments or thoughts?