Autosite.com Repairs/Maintenance Provides free, detailed information on auto care and repair, plus a preventative maintenance checklist.
ConsumerSearch Provides "the latest and best competitive analysis of products" for free.
Consumer World Provides 1400 of the most useful consumer resources on the Internet. The site offers information on issues from the latest FTC scam to consumer banking to hospital rankings to tax cutting tips to cheap airline flights and more.
ERsys (City comparisons)
"Using maps, charts, reports, and relevant links, Ersys covers over 2600 US cities with detailed information on demographics, environmental factors, economic indicators, housing stats, media (newspaper, television, and radio), schools, transportation, local contacts, and much more!" The information is presented in charts, graphs, and tables, and will be especially useful for those contemplating a move.
Homepath A site from Fannie Mae to help with buying or refinancing a home. Includes a comparison of renting vs. buying and a calculator for estimating how much house one can afford to buy.
The Home Improvement Web
"The place to find your home improvement information including Companies, Contractors, Real Estate Professionals, Manufacturers and Supplies, Regional Businesses and Organizations, Shopping and Online Outlet Stores, Tips and How-To Information"
How Stuff Works From "engines" to "employment," learn how things and processes work.
Kelley Blue Book Used Car Guide This site contains pricing information from commercially sold blue books going back to 1976.