Tools and calculators

Life Expectancy Calculators

 * Living to 100
 * MSN Money/c

Retirement Calculators
need someone knowledgeable to provide comment/rating of these. Some are monte carlo, others not. Each has pros and cons.
 * firecalc
 * Flexible Retirement Calculator
 * Bloomberg
 * MSN Moneycentral
 * AARP
 * AnalyzeNow
 * Boglehead yobria's Easy Allocator
 * T. Rowe Price Retirement Calculator
 * Moneychimp Retirement Calculator
 * Monte Carlo Retirement Calculator
 * Retirement Planner

IRA

 * Roth vs. Traditional IRA
 * Roth Conversion Calculator
 * Required Minimum Withdrawal and Stretch IRA Calculator
 * Required Minimum Distribution (RMD) Calculator

Boglehead discussion on the above calculators

 * Bogleheads: Retirement Calculators?
 * Bogleheads: Retirement Calculator
 * Bogleheads: Financial Calculators

Portfolio Tools

 * Morningstar Tools
 * T. Rowe Price you can sign up for a free online account and have access to Morningstar tools
 * Boglehead David Grabiner's asset allocation worksheet

Backtesting

 * Boglehead simba's backtesting spreadsheets
 * Excel (ver rev7f)
 * Openoffice (ver rev7f)

Caution: Past performance does not guarantee future results.

Taxable-Equivalent Yields
Calculate the yield on a taxable investment that's equivalent to the yield on a tax-exempt investment.
 * Vanguard Taxable-Equivalent Yield Calculator
 * Boglehead tfb's Bond Fund Yield Calculator
 * Bond Calculator

College Savings Planner

 * Vanguard College Savings Planner
 * College Savings Calculator

Inflation Data

 * InflationDatacom.