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Several great bloggers on this list - SMD Teacher, TLWMSN, Free resources from the Net, EdTech Change, AT Cubed....to name a few!

"Undergraduates and grad students alike will appreciate the usefulness of these search engines that allow them to find books, journal articles and even primary source material for whatever kind of research they're working on and that return only serious, academic results so time isn't wasted on unprofessional resources."

A nice example of an infogrphic.  Not up to Tufte's standards, but still effective.

From site: "No matter how much you know, there is always something new to learn about science. While your college courses may cover the basics, you can get a more in-depth look at a wide variety of topics from Internet resources such as these great documentaries. These selections will help you explore everything from the inner reaches of the human mind to the outer areas of our universe and just about everything else in between. Better yet, they're all free to watch online so you can learn more without spending a dime."

Great list includes many free apps.