Internet reference sources.

• Yahoo Reference List
• Look Smart
• refdesk.com/
• about.com
• Deja News - NetNews link
• HowSstuffWorksm
• LifeTips
• HyperTextBook.com
• See Web-Info for others

Classification Systems, ...

• See Classification page.
• Knowledge Sharing and Acquisition

Dictionaries, Glossaries, ...

• Tech Glossaries
• Dictionaries list at yahoo
• MyWord.info
• HyperDictionary, WordSmyth
• Acronyms

Encyclopedias

• www.wikipedia.org A free encyclopedia built collaboratively using Wiki software
• Facts Encyclopedia
• Encyclopedia Britannica
• Terms

Weights & Measures

Books, Libraries...

Graphics

• Graphics - Icons

Products & Services

• Services ( Investing, Telephone, Colleges, ...)
• Products
• Gomez.com - Rates products and services
• Epinions.com

Companies - Organizations

Time & Space

• Current time at the U.S. Naval Observatory
• Calendars: time and date .com
• Time Zones: US at: time.gov, WorldTimeZone.com
  World at: places/time_zones,
• Sunrise - Sunset
• Geographical data - tallest Mountains
• Maps - Look Up City, County See Maps Page
• Mapping Information (Coordinate Systems, software, symbols, ...)
• Geographic Information System (GIS)

Information

Data

• Demographics (Population, Death Rate, ..)
• Speed - Acceleration
• Death toll - Disasters

Calculators - Financial/Math/Statistics

Weather

Communications - Codes and Abbreviations

• Letters - Post
• - Zip Code Lookup (usps.com)
• Postage Rate Calculator
  
• Post Office locations and last collection times.
• US Postal Service Rapid Information Index (usps.gov)
• - US State Codes
• Canada Provinces and Territories
• USPS International Mail Help 202-268-2440 or 202 314-7150
• Universal Postal Union
• USPS Global Delivery
• Address Format
• Telephone Information - Services, Lookup, Country/City Codes
• Internet Domains (.com, .org,)
  
• Official Country Names and Codes

Government Indexes

• Federal Consumer Information Center (US)