If you have ever contemplated purchasing the expensive Apple touchpad, I suggest you take a quick gander at this paper touchpad alternative. A DIY computer project, it'll have you scrolling and clicking in no time for only a fraction of the cost.
From the brainchild of Afrotech Forums user Dr. West, the paper touchpad is a rather simple project. Featuring pencil graphite on paper, this item also consists of four voltage dividers secured to each corner. Once you place your grounded fingers on the surface, signals are sent to each corner and you'll have yourself a paper touchpad!