This is an awesome sight. It actually animates each knot so you can follow it sort of step by step. Great thing is that it has all kinds of knots. Fishing, Boating, MT Climbing and many many others!!! Animated Knots by Grog
You tube has some good instructional videos on knot tying, rigging and throwing cast nets. Also surf and long distance casting. I haven't checked to see if they have any on kayak paddling but there are plenty of fishing and kayak fishing videos there. Just don't let the Boss catch you watching them at work.