Use your fingers to move your mouse around. I wonder what playing a game with it would be like. I will however not be picking one up until it’s been out a little while. Also, we’re all going to be sitting at our desks waving our arms around randomly. Surely this won’t look stupid.
UPDATE: Alright, I really want to buy one now.
Not So Fast 
Looks like a great idea coming of age and is affordable. I wonder what havoc will be reeked by older computer geeks with shaky hands. Could be quite humorous.