Coin Grading - By one of the Industry Leaders in Coin Grading - ANACS. Authored by ANACS' Senior Numismatist - J.P. Martin. A thorough and informative brochure on Coin Grading in a PDF format file which you can view and/or download. A must see for all coin collectors/numismatists.
Educational information on the Internet about coins and collecting is abundant. Here are just a few recommended sites.
United States Mint An abundance of educational information for coin collectors/numismatists.
American Numismatic SocietyThe ANS is another important member of the American (indeed, international) numismatic scene. They also have a nicely organized links page with extensive entries. Lots of research can be done here..