If you're concerned about a company, you should check the Better Business Bureau

Apartments

• apartments.com
• apartment ratings
• Craigs List

Cars

• Gas mileage
• Green vehicle guide from the EPA
• tax credits for hybrids

Coins

• price guide for US coins

Curios

• Klein bottles

Conference Phones

• Polycom

Clothing

• converting shoe sizes
• corsets
• colorful t-shirts, unfortunately the color runs in my Dragon Rider t-shirt
• masks - pricy, but cheaper than in New Orleans
• Skechers shoes
• Wicked Temptations - club wear and underwear

Electric shavers

• electric shavers - what to buy

Housing

• Bay Area housing prices
• patrick.net - average rents and more
• Silicon Valley housing
• Yahoo Classifieds

Jobs

• Career Builder
• Craigs List
• JobVent where employees rate their company (many companies are not listed there)
• Monster.com
• how to write cover letters
• job reviews

Jewelery

• ring thickness
• Properties of various gem stones (e.g. hardness on Moh's scale)

Light bulbs

• Light Bulb Emporium

Pharmaceuticals

• National Drugs
• MediSave.ca

Stock market

• companies on the Australian stock market

Vegemite

• Simply Australian - not cheap, but cheaper than anywhere else I've found to get vegemite in the USA