Dazel from the Berkshire Hathaway Shareholders board pointed out something that hasn't recieved much press- the recent dramatic fall in treasury yields, especially short-term. See this link.
Meanwhile in the world of computer-model trading,
"Wednesday is the type of day people will remember in quant-land for a very long time," said Mr. Rothman, a University of Chicago Ph.D. who ran a quantitative fund before joining Lehman Brothers. "Events that models only predicted would happen once in 10,000 years happened every day for three days."
More "black swans"!