I'm trying to find inverse ETFs such as SDS/SSO and URE/SRS. What others are there?

Also, which ETFs track the S%26amp;P500 other than URE and SSO? Do ETFs expire at some point? Any help regarding ETFs would be greatly appreciated! Love these investment tools :)|||Here's a pretty good list of short ETF's


http://en.wikipedia.org/wiki/Inverse_etf





And some others:


http://seekingalpha.com/article/31115-in鈥?/a>