Mt. Gox today announced that they’re temporarily suspending USD cash withdrawals, due to their existing processes being unable to adequately accommodate increasing activity. Mt. Gox expects withdrawals to be unavailable for about 2 weeks, during which time they’ll be working to increase capacity. Deposits, transfers, and withdrawal requests for currency other than USD are not affected.

Update 6/21: Mt. Gox has posted some comments about the news on their Facebook page, along with a hint about Litecoin finally hitting their exchange next month (see point #6).