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www.mystockoptions.com
Comprehensive site; includes calculators for figuring out options' values and potential taxes



www.smeal.psu.edu/faculty/huddart
Pennsylvania State University business professor Steven Huddart offers a simple calculator to help you determine when to exercise options



www.stockoptionscentral.com
Provides "what if" scenarios to see what your options are worth under different conditions



www.stock-options.com
Offers useful discussion forums