...The Beagleboard, that is.
Beagleboard is a fanless USB powered single board computer powered by an OMAP 3530 ARM Cortex A8.
It's got USB, Serial, SD/MMC, Stereo audio IO and DVI-D (via a HDMI connector) out. There are projects getting Android and Linux running on it as well as other OS's
I'm planning on running RiscOS Open on it.