Greetings, great thread.
I wanted to chime in on this college football debate, there are some great historic rivalries out there, but if we're talking today, right here and now its Alabama/Auburn by a country mile. It doesnt really matter that the rivalry was suspended through 2 world wars, and the Depression, the hatred festered over that 40 years and every year it just gets worse.
Its a 24/7/365 mutual disgust that invades every level of society in the state of Alabama. Five year old kids get in fistfights at Kindergarten over this thing, and generally started by Alabama sympathizers. I lived up there for 8 years and I have never seen anything like it, and even though I went to school in Knoxville, I'd never experienced anything like the Iron Bowl. In college football, its number 1.
NFL: Patriots/Colts
In all of sport: Yankees/Red Sox
I don't give a flyin flip about the NBA.