If you haven’t noticed, JLP at AllThingsFinancial  has created several useful calculators worth taking a look at. For those that don’t know, JLP is one of the few personal finance professionals who is a blogger so you can have confidence that these calculators carry a little more credibility than most (unless JLP is bad at math, I have no idea!)… if you have a moment, please check them out and let me know what you think (or what calculator you’d like to see):
Investing and Planning
College Cost Estimator 
Financial Goals Calculator 
Life Insurance Needs Calculator 
Retirement Planning Comparison Calculator  – See how much you can possibly save retirement and compare it to the cost of waiting.
Tax Bracket History  – Only works for those who are Married Filing Jointly.
Annual Gasoline Costs Calculator  – How much does it cost you (gas, at least) to drive your car each year?