Frontline-the best documentaries on US TV

One of the best documentary shows on US TV is Frontline, on PBS. You can watch the shows online and the companion websites offer more details into each theme.
They've recently had a number of insightful episodes on a variety of topics which I'll link to and comment :

The Persuaders focuses on marketing and highlights specialists such as Clotaire Rapaille, a French-born researcher who helps Fortune 500 companies find their "code" and communicate to consumers' reptilian brains. Rapaille maintained a blog during the US presidential campaign where he expanded on code and archetypes in presidential politics.

Is Wal-Mart Good for America ? is a good facts-based report on the far-reaching consequences of Wal-Mart's sourcing strategies starting in the mid-1990s.

The Secret History of the Credit Card is a fascinating recap on the birth of the modern credit card industry in the beginning of the 80s, in South Dakota.