The saying that "Sometimes it takes a long time for change to happen quickly" might best be characterized by the ebook, which turns 40 this year. A great example of how sometimes an innovation is not a bad idea, it just takes a while for the right set of enabling factors to be in place for the technology to gain acceptance or adoption in the marketplace.
Anyway, for an interesting read on the history of the ebook, check out the history page on ebookweek. Note that the next national "Read and ebook week" is coming up on March 6-12, 2011.