Niall Ferguson, author of the newly released book The Ascent of Money, and participant in my favorite PBS series of all-time, Commanding Heights, has put together a two-hour program for PBS with the same title as his new book. I've only watched about half of the program so far, but I already recommend it even if the second half features Prof. Ferguson twiddling his thumbs in the dark in silent meditation. Watch it all online now.
Recommended especially: Ferguson's linguistic analysis of the word "credit" around 5:40 into part two, "Trust." From the Latin root credo, meaning "I believe."