Similarities between the Big Dig and Longhorn
I must confess that parts of this remind me a bit of Longhorn, Microsoft's next OS. There are "Big Dig"-like parts of Longhorn, like WinFS [a new storage technology] and Avalon [a new UI platform] ie major revamps of huge chunks of the operating system. And, inspired by this, a lot of other teams basically decided "Hey, if they get to really replumb everything, why shouldn't we do the same ?", as a result of which for a while Longhorn was basically shorthand for "a constantly-morphing set of features that nobody can make any progress on because it's so intertwined that everything depends on everything else and everything else is undergoing revolutionary change. Oh, and we want to ship it in 2 years." It was starting to settle down a bit before I left, but I suspect that there's a lot more settling to be done.
PS: I believe this last paragraph is technically an instance of "leaving the tent and p!ssing back in", but I don't think that it really qualifies as full-blown micturition [isn't the internet amazing ? you can find a graphic of anything ...].