www.snesot.comOnline tournaments for Super Nintendo. There are a range of games covered including Super Mario Kart, NHL94, Micro Machines 2, Super Tennis, Street Fighter, and Super Tennis. Plus many more.
Its only been up and running since March, but there is already a fair amount of people playing on a regular basis. The best in the world at SMK, Super Tennis, and NHL94 pretty much all play on there now.