More than a $10 USD difference between Bitstamp and Mt.Gox... I mean, I get the press release and all... but that doesn't seem like a sufficient reason. Especially for people who have a lot of USD on Mt.Gox, you'd think they would be fine with waiting a few weeks for the issue to resolve... (which I think it will)
"Money I can't afford to lose" aside, I wouldn't even risk "money i don't want to lose" by holding cash at Gox. Gox has never release their strategy for holding cash. We have no idea if it includes segregated accounts or how much has been frozen in the US bank seizure. Taking a 20% loss now is much better then taking a 100% loss tomorrow.