The ongoing Northern Rock disaster and a note from a colleague reminded me that very few people have any idea what is behind a lot of this mess.
One of the best descriptions I've seen was on a mathematics blog (one with an enjoyably low opinion of engineers who opine on matters economic).
However, my colleague has gone one better. He discovered a presentation that explains it all. Well, not quite everything. And it's not quite accurate in all respects. Or, indeed, in many. Still quite fun though.