Once you click on the progress bar to give it focus, if you slowly swipe your finger across the top of the Magic Mouse you can advance the play pointer. While I am listening to my local radio station's podcast, I can slide the play pointer past the traffic report and to the weather. You can control the speed and how much the pointer moves based on the speed and directions based on the movement of your finger on top of the Magic Mouse.
It's not an Earth-shattering hint, but it's cool!

