Browser Books are very simple, leveled books. There are ten levels on a variety of topics. You press the arrows to turn pages and click on the words to hear them read.
Silly Books are flash animations of children's books. There are also flash videos of songs and some interactive games. Some of the books have "click on the word" vocabulary support. I have been experimenting with downloading some of these books and inserting into PowerPoint, Classroom Studio and Clicker 5 for greater accessibility with some success.