I can't think of many online demonstrations that would tell you more than ryder's book, but there are some good ones. Jimmie Arroyo posted a hair demo on Wet Canvas. It includes close up scans of his work, which we don't usually see:
http://www.wetcanvas.com/forums/show...hreadid=134738
His technique is the opposite of Ryder's, in that he consistently follows the direction of the hair (with great success). It goes to show you -- there's more than one solution for any problem in art.