ProShares ETF

Note: I am not responsible for any losses/gains made off of this information. This is just my opinion.

http://www.proshares.com/funds/sdow.html

With the markets looking to be in for a rough next few days, shorting it isn't a bad idea. This ETF's symbol is SDOW and is a triple inverse of the price movement seen in the Dow Jones. If the Dow crashes 10% in the time you are holding shares of this fund, you make roughly 30%.