My friend has just launched a kickstarter project which is for a Mini-ITX Motherboard which mounts a raspberry pi.
http://www.kickstarter.com/projects/kwa ... i-fairywre
It's called the Fairywren and has things like usb, serial and a IR sensor all on board and fits neatly into a mini-ITX case.
from kickstarter:
17×17 cm Mini-ITX size motherboard
ATX 24-Pin power socket, always gives you enough power
Programmable power system
Built-in 4-port USB hub
2.5 inch SATA hard drive area
RS232 serial port, for terminal connection
Raspberry Pi 26-pin GPIO broken out
Built-in IR remote module, wonderful for XBMC
3.3V, 5V and 12V power output, for you monitor or other devices
RTC (Real-Time Clock)
Built-in temperature sensor for the cooling fan (Controlled by program running on the Raspberry Pi)

What do u think?