Long awaited RasberryPi, A creditcard size Linux PC is on sale. The RasberryPi has 2 models.
The RasberryPi is powered by ARM11 700MHz processor backed by 256MB RAM (B Model), Broadcom Video core capable of playing 1080p, HDMI port, 2 USB ports (model B), 10/100 LAN port (Model B), GPIO, UART, I²C bus, SPI bus with two chip selects, powered by 5 volt via MicroUSB or GPIO header. You can see the differences etween the A and B models in the following image.
The RasberryPi planned Operating systems are Debian GNU/Linux, Fedora, Arch Linux and recently developers managed to run XMBC on RasberryPi.
You can get more info on RasberryPi