Has anyone looked into these two ETFs? Its a very interesting concept, but it doesn't seem like they trade in any kind of volume you would expect for an oil ETF right now. I wonder if the concept they use for these will carry over to other commodities or even individual stocks or sectors. http://www.marketwatch.com/News/Sto...9A31D4}&source=blq/yhoo&dist=yhoo&siteid=yhoo