Citation guides (MLA, APA) - EasyBib.com
Country travel info - U.S. State Department
Dictionary - Merriam-Webster
Encyclopedia - Columbia Encyclopedia (via InfoPlease)
Fuel Economy - FuelEconomy.gov provided by the U.S. Department of Energy
History - The History Channel
How-to/How come - How Stuff Works
News stories from across the Internet - The Daily Source
Phonebook - Switchboard
Quotations - Bartlett's Familiar Quotations
Social Security Online - U.S. Social Security Administration
Statistics - U.S. Census data (current & historical)
Zip Code Lookup - U.S. Postal Service