Some time ago I read the slides from Greg Wilsons excellent presentation Bits of Evidence.
Today I found out that it's on YouTube (see comment).
I find it fascinating that the scientific studies of software development apparently seems to be mostly ignored or unknown to our community.
http://www.youtube.com/watch?v=_5UwJM2kGfo - Bits of Evidence: Code inspections
Unfortunately it's divided in chapters without any indexing so it can get a bit confusing since you most probably aren't going to be able to watch them in the order he presented them. Still worth it!