Financial Calculators (For those that want to go a lot more in depth and really KNOW your companies)

Figuring Profit/Loss from Selling Shares
http://www.womens-finance.com/calculators/stockcalc.shtml

Predict Future Value (This can be a great tool since we are only actually investing for about 2 weeks)
http://www.dinkytown.net/java/FutureValue.html

Short Term Investment Calculator
http://www.money-zine.com/Calculators/Investment-Calculators/Short-Term-Investment-Calculator/

Capital Asset Pricing Model (Can help the investor figure out the expected return on a capital asset at a given risk - this one is a little complicated).
http://www.money-zine.com/Calculators/Investment-Calculators/CAPM-Calculator/

Intrinsic Value and Return On Investment Calculator (You can use this intrinsic value and return on investment (ROI) calculator to help you evaluate a stock you might be researching.
http://www.money-zine.com/Calculators/Investment-Calculators/Intrinsic-Value-and-ROI-Calculator/

Profitability Index Calculator (This profitability index calculator can be used to figure out the benefit to cost ratio of an investment. Profitability index is simply the present value of future cash flows divided by the initial investment. When the profitability index is greater than 1.0 the present value of cash flows must be greater than the initial investment, therefore the investment must also have a positive net present value).
http://www.money-zine.com/Calculators/Investment-Calculators/Profitability-Index-Calculator/