Yes I'm an idiot. I let twit.tv expire. I've renewed it now, but if you get a GoDaddy landing page try thisweekintech.com instead. You won't be able to log in, however, because the login points to twit.tv. As soon as the renewal propagates through DNS everything should be back to normal.
I've renewed for nine years, so this shouldn't happen again until 2015.
It just shows you how confident I was about TWiT that I registered the domain for only a year!
(In my own defense, I had auto-renewal turned on but GoDaddy had an expired credit card.)