Take a look at the following site -- lots of good info here...
http://www.bruceclay.com/web_rank.htm
Good luck,
Jim
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James A. Rebman
Cognitive Levers Project
Center for Life-Long Learning and Design (L3D)
University of Colorado, Boulder
"In times of change, the learners will inherit the earth, while the learned
will find themselves beautifully equipped for a world that no longer exists."
- Eric Hoffer