I came across an excellent news article by Gartner Research that has developed a graph which plots the current adoption of various technologies such as 3D TV, Ipads and ebook readers and many other technologies.
According to them ebook readers are about 2-5 years away from mainstream acceptance and 3D TV and IPads are at the peak of their initial hype.
Go to:
http://www.smarthouse.com.au/TVs_And...ustry/D2R4C8K7
to see the graph and new story.