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Good comparison chart of blogs, wikis & docs.

Which is right for your project:  Blogs, Wikis or Google Docs? A nice comparison chart.

easy to explore, visualize and communicate. As the charts and maps animate over time, the changes in the world become easier to understand. You don't have to be a data expert to navigate between different views, make your own comparisons, and share your findings.

WebGraphing.com delivers real-time, step-by-step answers to challenging mathematics problems. There are a number of unique, patent pending features that make our calculators easier to use and more powerful than other graphing calculators. In comparison, our calculators take more of the grunt work out of demanding computations that contribute very little either to student learning or teacher productivity.

Textbooks vs Wikipedia

I am in love with the info-graphic! Interesting comparison on salaries for levels of education as well.

56,00 apps (they can be filtered)