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Great FAQ about the how and what of Diigo transition. It also has some info on the differences of the two web resources. I personally recommend Diigo over Delicious because of the highlighting and stick notes. They are a great add-on for research.

Thinking Blocks is a suite of learning tools designed to help students solve math word problems accurately and efficiently. Using brightly colored blocks, students model mathematical relationships and identify known and unknown quantities. The model provides students with a powerful image that organizes information and simplifies the problem solving process. By modeling increasingly complex word problems, students develop strong reasoning skills which will facilitate the transition from arithmetic to algebra.