Someone is massively profiting from these swings. Whether it's MtGox's flaky servers or DDOS or whatever. This isn't the behaviour of a grown-up currency.
I have no doubts in the sentiments of buyers right now but this kind of volatility is getting me worried.
Pretty normal for Bitcoin.
As volume increases I get the feeling Mt Gox just cannot handle this. Could be make or break for Bitcoin in the short-term.