On June 8th Nintendo is set to release their Wii MotionPlus accessory. With a $20 price tag MotionPlus is designed to improve motion detection in the Wii controller, using gyroscopic sensors to mimic your exact hand motions.
MotionPlus has been confirmed functionality with 5 games so far (Tiger Woods, Wii Sports Resort, Grand Slam Tennis, Virtua Tennis 2009 and Red Steel 2.) and is expected to be bundled with Wii Sports Resort, Grand Slam Tennis and Tiger Woods PGA Tour ’10 later this year.
You can read more about it here and here
it was just a matter of time for these things.