Organizations
Aikikai Hombu Dojo - World headquarters of Aikikai-Aikido
Aikido Schools of Ueshiba - Official ASU website

Dojos
St. Petersburg Aikikai, Florida
Milwaukee Aikido Club, Wisconsin
Aikido Shobukan Dojo, Washington D.C.
Boulder Aikikai, Colorado
Chicago Aikikai, Illinois

Information
Aikido FAQ, more information, multimedia)

Books
On Mastering Aikido, by Daniel Linden

Supplies
Bujin Design (USA)