Airline? AAI's been mentioned. Their cash position, relative to their size, is looking tight. I could see them violating financial covenants and having the same thing happen to them.
Better shorts? LEH, MER, MS. Word is that another IB is getting ready to go Bear Stearns - I've bet against LEH and MER; may add a short position in MS. Problem is, there'll be no JP Morgan to step in and rescue. C and COF are also good shorts. DSL, FED are likely to get shut down this year.

Careful with shorting stocks; there's a lot of money to be made but it's a much higher risk strategy. You need to have nerves of steel; it's not nearly as easy as it sounds. Consider longer term put options.