Raspberry Pi : Cheat Sheet ($25 ARM computer)
silicon.com
silicon.com
That said, it is a tiny board (about the size of a USB stick) with 700MHz ARM11 and a Broadcom GPU with OpenGL ES 2.0 support and 1080p video decode. It will have an HDMI port and can connect to keyboards and mice and will run Linux. Should be available in November. More details here: http://www.raspberrypi.org/