All publishing is broken right now. We’re working on fixing it.
Update, 10:15AM: We have Blog*Spot publishing working again. External publishing coming soon.
Update, 10:41AM: External publishing is working again as well. Plus users, we haven't forgotten about you.
Update, 10:50AM: Everything sorted out now and working fine. Expect possible transient slownesses as we shore up some of the quick fixes that we had to make.