I have a couple comments about fluorocarbon for leaders:
1) ALWAYS wet your knots before tightening!! The heat/friction makes the line very brittle at knots if you don't.
2) It does not stretch very well. This means those of you who run heavier main line with stiffer rods (and fluorocarbon leaders) and like to horse the big guys in - you will blow out the leader every time... That's why it tends to work better for the fly fisherman and float/jig guys(using longer, more flexible rods).

-Chad