I'm half-way through reading Freakonomics by Stevem Levitt and Stephen Dubner. There's something interestingly counter-intuitive on every page.
Apparently, after 9/11 people in American offices became slightly more honest (a 15% decline in theft, as measured by a bagel supplier who used honesty boxes for payment).
Smaller offices are more honest. And, the higher up the corporate ladder you go, the more dishonest people are!
Plus, people in good moods, and people who like their boss and their work, are more honest.