Neckties.com Covers the Four-in-hand, the Windsor, the Half-Winsdor, and how to make the finishing dimple. Step by step illustrations and instructions.
ToTieaTie.com There are descriptions of how to tie knots and how to clean and care for ties.
How-to-Tie-a-Tie.org This site has graphics illustrating how to tie the basic knots.
TieKnot.com Six ways to make a tie knot with illustrations. Descriptions and difficulties.