The State Quarters Series - This site contains mintage figures, descriptions, and images of each of the State's quarters. - http://www.treasurerealm.com/coinpapers/USCoins/50StateQuarters/50StateQuarters.html
50 State Quarters - For coin collectors interested in the State Quarters program of the U.S. Mint. It features concise, readable explanations of the history behind each quarter design. - http://50states.us/
The United States Mint 50 State Quarters Program - The official page with information about the 50 State Quarters. - http://www.usmint.gov/mint_programs/index.cfm?action=50_state_quarters_program