I also have 2 of them :
#1: FreeNAS 0.7 on a 8GB stick
Default 1GB RAM, no GPU
4x 2TB WD green UFS, in a 2x RAID 1 config (opted out of RAID 5)
In this config I only managed 3.2TB, so Im probably going to remove the second RAID 1 and run as 1x RAID 1 for 'mission critical' data and 2x 2TB Standalone which should give me 4.8TB.
I still need to tweak this a little as my write speed across my home GE LAN is only 80Mbs at the mo.
#2: XBMC Live 10.1 on a 16GB stick
1Gb RAM
Inno3D GT210 Passive ( Had to bend the fins on the heat sink - currently runs around 70'C peak)
IOGear GKM561R wireless keyboard
USB PC Remote ( BidorBuy elcheapo - got it for the IR Port - currently use my HDPVR Remote)
XBOX 360 Wireless PC Adapter
Emulators dont run too well within XBMC on a low end machine, so Ive reconfigured the server to 1st boot into fluxbox, and then to start XBMC (which hasnt affected XBMC performance). To start an emulator, I exit XBMC which takes me to fluxbox automatically where I start the emu - I have no issues running SDLMame and pSX like this so far.