John Muratore now works at SpaceX, but this is a pretty good interview with him during his NASA days.

There's a particularly enlightening paragraph about how he retooled Houston's mission control using the "pirate paradigm" and the "build a little, test a little, fix a little" philosophy. Even though this was back in the 80's, it seems like the kernel of more rapid/agile/test-based dev process that's well known today.