Another Roger Federer video in slow motion. Watch the Palm down position on the backswing on the serve, watch the non-stop motion (something I believe in more than anything) of his serve. See if you can spot the pronation on the contact point, we have a excellent explanation on the site further down!
Now lets look at the forehand inside out. The things to watch for are as follows:
How early he takes the racket back
How still his head is when he hits the ball
How loaded his right leg is before the shot
How balanced he is on his big base after the execution, he is perfectly positioned to push off hard to the next ball.