DIG and DUG "The key for the double ETFs is that they are designed to double the performance of the index ON ANY GIVEN DAY. However, over time, they will definitely lose their value due to compounding." <a href="http://potrix.com/ryan/b.do?blog=/08/10/30/b_175123.txt" target="_blank">http://potrix.com/ryan/b.do?blog=/08/10/30/b_175123.txt</a>