[quoting Hart, 25 Jul 96] 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.
I certainly agree that content is the important issue, however, I also think it's important to note that certain trucks deliver food much better than others. So, my thinking is that the medium is not unimportant. Rather, it is not the end in itself but a vehicle for delivering what is important--the content.
By the way, I think this is a fascinating, and very important/fundamental, discussion.