Not sure about a website, but, there was a good book about aerobatics that described the moves, drawings showing the move, and a detailed section on how judges score maove at a competetion.
I can't remember the name of it, I think it was just called 'basic aerobatics'. it had a picture of Hanno Prettner on the cover.
Anyone else know the name of this book??

Also, the G3.5 sim includes a virtual instructor section. You are shown moves by top pilots and told how to do them. A Tx is shown so you can see the control inputs. This covers both planes and helis.

Hope this helps.