Cell Phone with Built-in Projector

karvind writes "Siemens researchers have developed a cell phone featuring a built-in projector system. A laboratory model was presented at CeBIT 2005 in Hanover. The system makes it possible to project a complete keypad or display onto a surface. With a special pen, users can write on the virtual keypad and operate the phone's functions. Other projection keyboard concepts can be found here and here"