Determined to find exactly how small a personal computing device can be and still be workable, Wibrain recently introduced the B1.  Basically a full-featured computer with a 4.8 inch screen, this little slugger can run at a resolution as high as 1024x768 (quite possibly the resolution at which you're viewing this page right now).  It has no CD drive, but has Wifi and Bluetooth, making it easy to load programs.  Combine that with a QWERTY keyboard, a touch screen, AND a touchpad, and you've got a computer that can fit in a large coat pocket.