You may have heard about E-books, you may even have heard about the Amazon Kindel (E-book reader), but did you know that there is a ton of other E-book readers on the marked? I personally had expected perhaps 5-6 different models, but acording to this link there are up to 39 different models (some not released yet though). If you are interested in E-books then it may be worth your while to visit http://wiki.mobileread.com/wiki/E-book_Reader_Matrix