Berkshire Hathaway (A) can swing $2000 a day, but since it is ~$150,000 a share this is only 1.33%. Lets hope that Bitcoin gets to where it will be having similar $2000 swings. :-)
Off topic, but it would be huge publicity to get a quote from Warren Buffet on his thoughts about Bitcoin.
He will probably give a negative review of it. He's rich in fiat. He has no interest in something that goes against the Federal Reserve. That's what I think anyway.
Back on topic: MtGox lag really is annoying. It's cost me money a few times, not being able to cancel an order quick enough. They really need to do something about that.