Just so we can all understand how little a deal this Tiger Woods spitting thing is (he did get fined, so I guess someone cared), here are photos of other professional golfers spitting, and these are just the ones I found.
Jason Dufner just a week ago at the Waste Management Open (Via White Seated via Devil Ball).
Dudley Hart at the BMW Championship in 2008
Huey Lewis at the Bob Hope in 2008
Sergio Garcia with the infamous "spit in the cup" (which I do think is disgusting because others have to snag their ball out of his spit)