Society for Human Resource Management (SHRM)
Membership organization. Includes HR conferences, forums, jobs, resources, tools, publications, and their HR Magazine.

Employee Relocation Council (ERC)
Another membership organization, with good info online to all. Includes news, tools, resources, jobs, conferences, and their Mobility magazine.

Embassy World
Very good, detailed maps worldwide

WorldAtlas.com

WorldTimeServer.com
Excellent tool to help plan meetings across the globe.

U.S. Citizenship and Immigration Services (USCIS)

US Social Security Administration

Non-US Social Security Information

Internal Revenue Service

U.S. State tax sites

XE.com Currency Services
Currency and foreign exchange, including detailed currency info, current exchange rates and conversion tools.

Babelfish
Translates between Chinese, English, Dutch, French, German, Greek, Italian, Japanese, Korean, Portuguese, Spanish and Russian.