This short video preview from Cameraworld in South Africa demonstrates how the Vanguard GH-300T Pistol Grip works. This interesting camera ballhead announced early this year incorporates an interesting addition a built in shutter release mechanism (connected via a replaceable cable which fits most cameras) which allows you to take pictures just like you shoot a gun. This is useful when shooting moving targets (bike, car racing and other sports).
The GH-300T is currently selling for just under $200 (on B&H).
Here is an official Vanguard quick video showing the GH-300T in action