A quirky-looking wireless adapter allows the Wii's nunchuck to be connected separately to the Wii-remote.
A small plug is slotted into the Wii-remote, which then connects to a fairly clunky nunhuck adapter (pictured below). The original nunchuck slides neatly into a shell, wires an all, and once synced players can freely move both hands about like a loon!
The Icon Wireless adapter runs off 2 AAA batteries.
Thanks to GoNintendo for the tip.