The referee or the linesman saw the ball over the line so couldnt have given the goal. If they had seen the incident clearly they would (or should have ) given a foul against Cech.
I can't beleive there are people here who have the benefit of TV and replays to suggest it wasnt a foul on Cech, and that the goal should have stood. Maybe their argument should be re-phrased something a long the lines of ..."Although I know that Giggs slid into Cech, taking him, and the ball, over the line unseen by the referee, he should have given a goal anyway."
Was it a penalty, well Ryan Giggs didnt seem to think so............
http://news.bbc.co.uk/sport1/hi/foot...up/6668517.stm
"He said: "It was clearly over the line - that's what I was asking for. I could see it was over the line and the referee didn't give a free-kick so it was a goal. "I felt I was getting to the ball quite comfortably and felt someone touch my leg.
"But I was claiming for the goal not the penalty.