The oil futures are in contango, and USO is suffering from it. I am in DBC, which has been doing well by rolling forward to the cheapest contract, and has 35% oil, 15% heating oil, and some agriculture and metals. Check out this web site and the "Hard Assets University" www.hardassetsinvestor.com
Oil futures are NOT in contango, they are currently in backwardation, the front months are more expensive than the back months. Just buy the futures, don't screw around with ETFs and their fees. Buy the 2nd to front month and roll the contract every 2 months, its not that hard to do.
Oops, you are right, no more contango. Bottom line - it adds another variable when playing USO. Agreed that futures are best.
Just realised i still have an account open with optionsxpress. Looking at their site they offer a variety of futures contracts including energy. Looks excellent.