Portability is my greatest concern. I would love to see a MacBook (or other) thinner and about 30-40% smaller than the old PowerBook 12". I want a machine that is fully functional, but yet small enough that I can take everywhere, all the time. Screen/keyboard size is not an issue as long as it has the capability to hook up to external devices. CPU, harddrive space, and RAM are important, but a small form-factor should be priority. It must have Wifi and Bluetooth capabilities.