The Linux kernel map that I did with Rusty and Karim Lakhani is now up on OSDN.
On the one hand, I'm pretty happy with how it turned out, and that its performing pretty well under heavy load. On the other hand, I find it a bit strange that BCG wanted to do it when the map is pretty, but not actually useful as a way to navigate or understand the kernel.
Amongst all the usual garbage on Slashdot there were at least three insightful comments: why is BCG interested in open source hackers?, and here, and here.