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Very technical -- but interesting research "It is well established that children, adults, and nonhuman animals share a basic ability to perceive and compare nonsymbolic quantities of items, commonly referred to as "numerosity." Symbolic numerical representations build on these basic abilities to enable human children and adults to use precise number words, symbols, and linguistic quantifiers"

Math Tools is a project of The Math Forum @ Drexel, funded in part by the National Science Foundation. The goal is to create a community digital library that supports the use and development of software for mathematics education. We began work in September of 2002 and through the help of many people there is already an active and rich resource center.\n\nYou are the key. The point is to enable users to help each other use technology effectively in the math classroom. By sharing our experiences, activities, comments, and needs, we can help each other find tools that are known to work well and learn how to use them and improve them. Teachers, students, researchers, publishers, and software developers are all working together in Math Tools

He is one of the best I've found on teaching mathematical thinking. He's also generous to the extreme about sharing his material.