I'd also like to introduce Storia, Scholastic's free ereader. All you have to do is download and install the Storia eReading app to the device of your choice. After you've downloaded and launched the free Storia eReading app, you may assign five free ebooks. Storia is set up like shelves of books that you assign names to. The five free books range in levels but Scholastic has ton of ebooks to choose from if you want to purchase more. I have Storia on my library netbooks and several of our special services teachers have uploaded it as well. A really neat feature with the stories is that periodically, as you are reading, a little lightening flash comes up and offers support questions and games for the story thus promoting "thinking about reading". The stories have audio that can be turned off and on depending on the reading level of the child. There is also a dictionary attached that will give definitions of words when you double click on them.
Emerging tools are my favorite.