MtGox being a USD black hole creates a situation where no one wants to sell their bitcoins there, because, why would you do that? No way to pull out dollars. This creates a huge BTC shortage on Gox, and more fuel for this bubble.
At this point, Mtgox is at $1200, and Btce is at $940. Market thinks goxbux are worth 75% of real dollars.
Um, btc-e has not been accepting bank deposits for about a week now, so btc-e bucks are overvalued. I'd be careful putting too much weight on that exchange's price, just like you should be careful with MtGox.