I've played a little bit in goal and one tip I've picked up on penalties is to stand a few inches to your weaker side, narrowing the side you don't want the taker to put it and then commit to your strong side, I.E my right. I wonder if Cech's aware of his dismal record and what he's doing to change that.
Watch the standing foot (i.e. Wilshere's right)of the player taking the pen as he placed the ball on the spot, it generally points where the balls going