College

https://collegeabacus.com/
http://www.savingforcollege.com/
http://www.collegescholarships.com/

Early Retirement

http://earlyretirementextreme.com/
http://www.mrmoneymustache.com/
http://retireby40.org/

Real Estate

http://www.zillow.com/
http://www.trulia.com/

Financial Calculations

http://www.bankrate.com/   This website has a calculator for just about every financial question you could imagine.  
http://www.pwycpas.com/financial_tools.html   So does this website, but also more so for businesses.  

Retirement

All retirement calculators are going to give you a different answer because they assume different parameters.  Go through them all to get a ballpark figure and then choose the largest amount for your goal number.  
http://cgi.money.cnn.com/tools/retirementplanner/retirementplanner.jsp
http://www.bloomberg.com/personal-finance/calculators/retirement/

Insurance

If you ever feel the urge to learn more about insurance.  Always try to get your insurance policy reviewed by an unbiased 3rd party who has no vested interest in whether you buy insurance from them or not. 
http://www.iii.org/