It used to be that graphics cards and processors defined a PC but I for one think the most defining characteristic of a computer are the parts you actually interact with: the display, mouse and keyboard.
Wireless Entertainment Desktop 8000, Microsoft $249
This media keyboard, otherwise known as the Ultimate Keyboard, due out in May features a magnetic dock with 4 USB ports. The ultra-thin ergonomic design was reportedly influenced by inspiration from details found in Cadillac and BMW interiors. An aluminum finish makes this keyboard quite attractive.