I'm not affiliated with Mt. Gox, but I wanted to help spread the news in case some of you aren't checking their site regularly. Their original statement about temporarily shutting down their exchange was:
"Trading is halted until 2013-04-12 02:00am UTC to allow the market to cooldown following the drop in price."
They've added a note that they'll not charge trading fees initially when they reopen:
"Additionally trading fees will not be charged within 48 hours of trading resuming (until 2013-04-14 02:00am UTC)."
Their support page is the place to watch for updated news:
https://support.mtgox.com/home