I turned it off once or twice this year
I had an uptime of about 110 days on it until I decided to do some windows updates.
It runs Win2K.
I use it as my portable DVD player, winamp jukebox (connected to some speakers when I dont' want to use my headphones which are connected to my main rig), portable webcruising box, whenever I'm away from home for more than 24 hours box, and every now and again, Openoffice Calc Spreadsheets.
Not bad for the $300 I spent on it a year or so ago ....