I was just doing some work for Google and came across this query. The Goal of the Cetury was chosen via a poll on the FIFA site. Number 1 goes to Diego Maradona (Argentina) 1986 FIFA World Cup vs. England 18,062 votes: 60-meter run from midfield beating Reid, Beardsley, Butcher, Fenwick then the keeper Shilton before tucking it away.
Check out the top ten list on Wikepedia: Goal of the Century