I posted some days ago an appendix by Feynman in the Challenger report, "Appendix F - Personal observations on the reliability of the Shuttle"[1] for those interested. Also, half of "Why do you care what people think?" is about his experience investigating the safety of the shuttle.
A lot of what he said regarding reliability figures and testing plans reasoning resonated with my experience in (software engineering) projects and made me think how his remarks are applicable to software development.
Note to people who didn't read the appendix - he touches specifically software development in the latter part of his note.
[1] http://news.ycombinator.com/item?id=4371024