General Aikido sites
Aikiweb http://www.aikiweb.com/
Aikido Journal http://blog.aikidojournal.com/
Aikido Express http://www.aikidoexpress.com/ Videos of USAF Shihans and other resources
Aikido Sphere http://www.aikidosphere.com/welcome.cfm Articles on USAF Shihans and other resources
Supplies
Mugendo Budogu https://www.budogu.com/index.cfm?
e-Bogu.com http://www.e-bogu.com/Default.asp
Tozando.com http://tozando.com/international/
Dojos
Aikiweb http://www.aikiweb.com/search/ A great search engine to find Aikido dojos by location
United States Aikido Federation http://www.usaikifed.com/ Test requirements, news, event calendar and a dojo list.
Antartica Aikikai: Aikido, Penguins, and a beakful of beer. (It needs a bit of updating.)
Aikido of Park Slope, Brooklyn, NY http://aikidoofparkslope.com/home.html (Hi, Hal, Gordon and the gang!)
Aikido Society of Memphis, TN http://www.aikidosocietyofmemphis.com/ (Hey, Bob, Brett and everybody!)
New York Aikikai http://www.nyaikikai.com/ (Hi, everybody!)
Open Sky Aikikai, Hillsborough, NC http://openskymartialarts.com/ (Hey, Steve, Jessie and all you athletic people)
Aikido of North Jersey, Teaneck, NJ http://aikidonj.com/ (Hi, Jerry!)
Aikido Verein Freiburg e.V. in Freiburg, Germany http://www.aikido-freiburg.de/ (Hallo Andy und die Aikidoka in Freiburg)
Open Aikido Association , London, UK http://openaikido.co.uk/ (Hi, Chris and the werewolves of London!)