Congrats to England.
It wasn't just Warne that dropped Pietersen, though his was the easiest - Gilchrist and Tait dropped him also.
I have to admit Australia did a couple of things through the series that are going to come back to haunt them - like winning the toss in the 2nd test and sending England into bat, and taking the light when offered to them in this test when they needed to be out there for as long as possible. Both of these incidents have left me scratching my head.