same thing happened to me back in September...the damaged/theft totaled up to around 6k bucks...stole my xbox, all my games, dvds, 32" lcd, 5 guns, a digi camera, a phone, and the list goes on and on.....
they were in the process of taking my computer, but like in your case, something must have spooked them....
one thing thats odd in my situation, is that they stabbed my water bed...YES, stabbed my waterbed....ruined my carpet and subfloor.....
it still makes me sick everytime i think about it....i feel violated, like i have no privacy or something...very weird feeling i would say
but good luck getting your stuff back. So far, nothing of mine has turned up....