I have a few of them too.
One has been running as an XBMC box at home for just over a year now, it's one of the 256M units running OpenElec XBMC connected to my home network via mains networking, controlled via a Microsoft Media Centre remote control and receiver and it has played everything I have thrown at it so far. It is used pretty much every day.
I have played around with one at home connecting to RTC's Accellerometers, LCD Displays, Barometric sensors, Current sesnors etc using GPIO & I2C.
I have set a handful up for work in kiosk mode to run our web dashboard system and, again, had no problems to date.
Nice piece of kit when used within it's capabilities. Also served to remind me of the days when I was a Unix programmer!
Z