Have a look at the trailer for Arbitrage. I've heard that this film is well worth seeing. It's set in the world of hedge funds, arbitrage, currency markets etc so as well as being a very watchable thriller, you might also learn something about finance :-) I'm probably going to see it over the weekend, so it would be fun to discuss it on Monday. Another film I really recommend is Margin Call, starring Kevin Spacey, which is set against the collapse of a bank similar to Lehman Brothers. It's out on DVD.