I'm not sure how these replies relate to the theft of shares from the link I posted. How does Ghash have anything to do with it (other than me throwing my speculative question related to their involvement)?

The 51% thing is a big deal but I wanted to talk about the fact that there seems to be a critical flaw with the way mining pools currently work that people can exploit(not >50% attacks, read my original link). The 200-300 BTC that the pool lost is a lot. What really makes me worry is that people can do it on p2pool and no one can stop them as far as I can tell. And we want people using p2pool but no one is going to want to if it's being exploited.