Great visual resource for newcomers and those interested in understanding more advanced functionality.
Andy's Most Useful Knots
I've had this desire at the back of my mind to re-learn a lot of the knots I've forgotten since my days as a Boy Scout. I'm rather embarrassed that I remember so few of them actually. Andy's collection of knots looks like a great place to start digging in.
Bonus: knots look like a fun way to keep my hands busy while watching TV.