BookGlutton http://www.bookglutton.com/ BookGlutton allows teachers and students to share thoughts on a book. Many of the books are free. You simply (1) create an account, (2) create a group, (3) invite your students to join the group, and (4) select the book you will read as a group. Students and teachers can make personal notes to the left of the book and share comments and answer questions the group poses to the right of the book. Check out this overview of how it works: