This is something I would totally get for gaming, I think. As the title states, a group of University of California students have designed a 3D wireless mouse that somewhat works. The idea is to use the mouse without placing it on the surface. In this particular scenario, the students could move the device left, right, up, down, front and back for corresponding movements.
The following is a direct excerpt from the official project website:
This project was completed in March of 2006 with some success. The mouse does work, and the position of the mouse can be detected with an accuracy of 3 centimeters, over a range of 1 to 6 meters, with the position being updated 25 times per second. The mouse contains 5 general use buttons whose status are also updated 25 times per second. The mouse is also rechargable by simply plugging it into the wall with an AC adapter. The mouse will last about 14 hours on a single charge. Mouse coordinates and button states are sent to the PC over a USB link.
This project was meant to be a class project, and thus we don’t think we will see a 3D wireless mouse anytime soon in production. According to the group members, it would cost approximately $550 to produce additional units, which isn’t too bad.