(try it out) The CEPR Social Security Benefit Calculator  - This calculator estimates your family monthly income during retirement and compares it to other households in your county with similar demographics—your race, age, and marital status. Alternatively, you may compare to the state as a whole. In some cases, the available data may be insufficient to obtain a reasonable comparison. In such cases, the comparison will be to the overall county or state average. - CEPR.net

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(How long will you live?) Retirement: Live Long and Don’t Prosper - By Ben Steverman - Confusion about the life expectancy of the Baby Boom generation bedevils fiscal planning and retirement planning - Businessweek

also has Life Expectancy Calculator from Social Security Administration

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Doug Short has 2 posts with lots of great retirement / financial planning calculators: 

Calculating Your Finances, Part 1 

Calculating Your Finances, Part 2: Retirement