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Many asked the same question of the iPod in 2001, when there was a similar variety of music players already available. Early reviews suggested Apple's product was simply nothing new, that it just had a bigger price tag. Why did the iPod clean up the market? For starters, it leveraged some key Apple assets - well designed hardware specifically tailored for its intended use and an uncluttered, simple and easy to use interfac.
However, the most interesting element of this article is Apple's strategy to make iTV successful. It seems to follow the "Chasm approach" laid out by Geoffrey Moore.....
http://www.roughlydrafted.com/RD/Home/C408570C-520A-4433-B92D-B2B8219636E3.html