Whilst we're on the subject... here's some good ones...
http://www.geocities.com/SiliconValley/Network/4402/humanoid/humanoid_walk_cycle.htm
http://www.erain.com/blog/archives/2004/08/introductory_wa_1.html
http://www.idleworm.com/how/anm/02w/walk1.shtml
http://www.geocities.com/SiliconValley/Network/4402/humanoid/humanoid_walk_cycle.htm
http://www.erain.com/blog/archives/2004/08/introductory_wa_1.html
http://www.idleworm.com/how/anm/02w/walk1.shtml