ABX-HE-BBB 07-2 The ABX Index is a series of credit-default swaps based on 20 bonds that consist of subprime mortgages. ABX contracts are commonly used by investors to speculate on or to hedge against the risk that the underling mortgage securities are not repaid as expected.
They were announced but I think didn't come out yet http://seekingalpha.com/article/81244-macroshares-to-launch-levered-up-down-housing-price-etfs