Entire markets getting hacked doesn't bode well for a currency. In any case that's the market depth for tradehill, not Mt. Gox.
I've been following bitcoin out of curiosity, since it seems reasonable for a digital currency to exist, but at this point and given what has happened I can't see this particular currency lasting long-term. There are too many ways for it to fail. There isn't any legal precedent for digital currency, and when nations begin to legally deal with it, they may end up ruining the system by attacking businesses that accept bitcoin (among other methods). Given the utility for purchases made on the Silk Road and for money laundering in general, I would be surprised if gov'ts didn't end up taking action to hobble the bitcoin market. Bitcoins are only preferable to normal money if they have some utility that normal money doesn't, so if that utility is attacked successfully then the market is dead. Though it may collapse on it's own due to non-gov't events like hacked markets.
Personally I'll be sticking with established, secure money markets for the foreseeable future. In addition to the shaky future of the bitcoin market, I don't like the idea of an uninsured money account that I could lose simply by having a hardrive die on me, or a house fire that destroys my computer, or my wallet-hosting servers getting hacked. There's just too much risk to do anything beyond mine bitcoins using other people's electricity, as I'm currently doing

. It's been good for beer money, but the serious trading is still on the Forex.
edit: I read more about the hacking of Mt. Gox and it turns out they were using unsalted MD5 hashes to store user account information for something like a year. That's a horribly insecure for a market that handles such a relatively massive amount of trading volume. I'm staying well away from this nonsense until (if) it becomes more established and secure.
edit2: and then there's the possibility of
botnets rapidly mining, leading to devaluation.