Person Locators:

Anywho Reverse Lookup

Background Research:

Docusearch - Hundreds of links to free and reasonably priced searches

Ancestry - genealogy and ancestry information, including address and social security numbers for the deceased

Map Locators:

Map Quest

Corporate Research:

California Secretary of State corporation, LLC, and LP research

SEC Filings - keyword search of SEC archive

Hoovers Online - company profiles

Internet Research:

Network Solutions Whois - Search for websites owned by a certain person

Namedroppers - Search for all websites that include certain words

Wise Tools - Research tools to determine website information

Legal:

Lexis

Lexis One

United States Supreme Court Briefs