I'm guessing that a meteorite travels a helluva lot quicker than the average aircraft, so a strike could ruin yer whole day. But, having said that, I reckon you'd havta be real unlucky to get hit. I'm not aware of any reports or statistics on "close encounters" either.
The way I figure it, there's more chance of one taking out a GPS satellite, but that hasn't happened either... yet. Does anyone know of any studies that have been done on this? Gotta say that it isn't something that I've ever thought about while flying.