[referring Smith, 25 Jul 96.a] You've hit the nail on the head. Richard Clark pointed this our back in 1982, although Wilbur Schramm had been saying the same thing as early as 1969.
This distinction may be fuzzy, but then it is in my thinking as well.
The distinction is by no means fuzzy. It has been the tragedy of educational technology that so much fruitless effort has been spent over the past 50 years to try and prove that media affect (improve?) learning. Only content affects learning--the medium is, as Clark says, no more significant than the truck that delivers our food.