This website has TONS of free books that students can read online. I kept trying a bunch to see if I could find a book that wasn't on it...I couldn't!
I would suggest using this in your classroom as a tip for students in case they have forgotten their copy of the book at school, etc.
This blog is AWESOME! It relates to all level of educators, includes tips on classroom uses with technology, has news from all over the globe related to technology and education, and even has how-to posts. I find myself reading it daily now and even back-reading. A must read!
This is a brief blog entry describing the "circles" feature of the new Google+. It describes how it can be used for the classroom. I'm so excited for the possibilities!