Well I've tried watching the Super Bowl once (I'm a huge Rugby Fan), but found it a very slow paced game that was quite timmid compared to the more brutal faced paced world of Rugby.
I have on occasion watched some Australian Rules Football on Sky; and even though I didn't understand it; found it quite enjoyable. Apart from that, my intrest is mainly in Superbikes, Rugby and Shinty*
* Shinty:- Think of 'Grass Hockey', take away all the silly Half Swing Stick rules and strip the Goal Keeper of that puny padding and you have shinty. You're even allowed to chip the ball into the air and take a Baseball style swing at (thats how real men take penalties!). I've seen several people taken off the field with shattered shin-bones!
Sumo Wrestling and Mexican Wrestling are cool aswell. (They actually hit each other. Properly.)