NEC has a Pen-style Personal Networking Gadget Concept published.
P-ISM is a gadget package including five functions: a pen-style cellular phone with a handwriting data input function, virtual keyboard, a very small projector, camera scanner, and personal ID key with cashless pass function. P-ISMs are connected with one another through short-range wireless technology. The whole set is also connected to the Internet through the cellular phone function.
More about the NEC P-ISM at NEC Design.
There are more cool future designs on the NEC Design page like the wacca a visual memory bracelet.