Here are several tools and calculators to help you with your investment decisions:
Library of Congress Report:
Behavioral Patterns of U.S. Investors
Mutual Fund Cost Calculators
Scam Meter
Tax-Free vs. Taxable Yield Comparison Calculator
College Savings Calculator
Loan Calculator
Savings Calculator
Mutual Fund Breakpoint Search Tool
Social Security Retirement Planner
Risk Meter Ballpark Estimate
Retirement Calculator
529 College Savings Plan Expense Calculator
Investor Quiz: Test Your Money Smarts
http://sec.gov/investor/tools.shtml