Explanations of Credit Crunch issues from "QE" to "CDOs" to "toxic assets" etc, by man drawing on whiteboard!
http://marketplace.publicradio.org/collections/coll_display.php?coll_id=20216&page=1
For starters, I use this about interest rates:
http://marketplace.publicradio.org/display/web/2009/12/15/whiteboard-interest-rates/
And this about Quantitative Easing:
http://marketplace.publicradio.org/display/web/2008/12/22/whiteboard_quantitative_easing/