The Jimi is basically a J-shaped USB extension that brings a rear facing iMac USB port to the front. The design is clean and functional and snaps on to the bottom of the iMac air port so it stays put.
No more fishing around the back of your iMac to find an open USB port. The Jimi ($14.95) USB extension fits both 21.5-inch and 27-inch iMac computers. Clever.