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

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