I had a chance to read Christine Richard's book Confidence Game last week while on vacation. The book details Bill Ackman/Pershing Square's short position at MBIA Inc. and the drama that unfolds over the course of a few years while Ackman speaks to anyone who will listen about the company's unstable business model. It's really very good. If you're interested in activist investing I recommend reading this book. - Damien
In the meantime, here's an April 2010 CNBC video where Ackman and legendary short-seller Jim Chanos share their thoughts on short selling.