The only delivery I seem to be able to bowl when I bowl leg spin is the top spinner. To bowl a top spinner, you must roll your fingers (viciously) down the front of the ball which will put a considerable amount of over spin and top spin on the ball making it kick and bounce. You need to have a good chest drive (literally, drive forward with your chest) and higher front arm to make sure it goes as full as possible because since you are dragging down on the ball, it will naturally go short.
The variation to this delivery is the leg spinning bouncer which you may have seen from Shane Warne against Kevin Pietersen in the 2006/7 Ashes or Kumble to Sidebottom just two days ago. This is the conventional top spinner but with the drive being from the hip and back leg and the front arm pulling down to put all the weight into the pitch. This is, in my opinion, an underused delivery because batsman are often not in the correct position to duck or hook a leg spinner.
