It seems to me that every time there's a buzz over an exchange, something bad is about to happen shortly, as bitcoin-24 were gaining traction, boom, bitfloor were coming back in good form, boom, mtgox were doing so good that they were about to add LTC, boom.
I used to leave my 700 btc in gox for year, once they announced Coinlab agreement, I moved every dime out.
So, my 2 satoshis is, better use exchanges that are still under the radar, do your transactions, and move everything out.