Boating Knots

Covers several knots commonly used in boating.
http://www.tourismvictoria.com/Content/EN/206.asp

Marinews Boating

Covers common boating knots including the Cleat wind, Clove hitch, and Wagoner's hitch. Animations and common uses.
http://www.marinews.com/bk_knots.htm

Shooting Star's Marlinspike Page

Covers common boating knots including the Anchor bend, the Carrick bend, the Buntline hitch, and several variations of the Bowline. Animated illustrations and step-by-step instructions. Table showing the relative strength of the knots.
http://131.230.57.1/knots.htm

Boating Magazine

Pictures and instructions on how to tie a few knots.
http://www.boatingmag.com/article.asp?section_id=8&article_id=246