General Geography Sites
About.com Guide to Geography - This is a super-big, super-excellent site on geography.
Lonely Planet's Text Express - Extra!  Extra!  Read all about it!  Read all about life in other countries!

Flags
Flags of all Countries - Comprehensive list of flags from all countries.

Latin America
Latin American Studies

Middle East
ArabNet - Current news coverage, plus country profiles of every country in the Middle East.

United States
America's Story - Just click on the state you want to explore!
50 States - We love this site!  Find information on all of the states in a simple click!
United States - this site will take you directly to the home page of any state.  A good source of information when you're researching a particular state - or when you're planning to travel.
U.S. Census Bureau - Find information about your state from our government!
State Reports -- If you're doing a report on a particular state, this is the site for you!
Happy Birthday America! - Find the Pledge of Allegiance, Star Spangled Banner, and more!  Great links to government and historical resources.

World
World Factbook