Well, last month it was the Mozilla folks who hyped the release of Firefox 3.0 and then had their servers fold under the load.  Today, it seems to be the iTunes site wilting under the load of all the folks trying to activate their new iPhones.  If you are among those folks (obviously you aren't reading this from your iPhone then), all we can say is keep trying, the spike eventually decays to a point where the system can handle the load, but that is obviously of little solace to those who are without a phone at the moment.

Update: Some of my fellow handlers have pointed out to me that the problem is made somewhat worse by the release of the new firmware for the older iPhones and the MobileMe roll-out.