Seidokan Aikido HeadQuarters world wide web page : http://www.seidokan.org
HeiSei dojo other (and bigger) site , by Avi Shaul : http://window.to/aikido
Seidokan Aikido Jerusalem - Yoav Rosental's page (great page, many clips) : http://seidokan.url4life.com/
Everything (!) about Aikido : http://www.aikiweb.com/
Aikido Dojo Search Engine : http://www.aikisearch.com/
The Aikido FAQ (Frequently Asked Questions) : http://www.ii.uib.no/~kjartan/aikidofaq/aikido.html
Aikido MPEGs : http://www.scri.fsu.edu/~murray/aikido/mpegs.html