Just a rough guesstimate, I'd say somewhere from 100-500 btc was lost in this mess.
It was apparently more then that. According to
this thread, all the
BTC was sent to a single
address, and totals just shy of 5,750
BTC.
It looks like they also have 1,000
BTC at 1KBjrcKeRjX2k1EmLm7HkKuyoWr73YhZoH