It would be interesting to see how the value of a dollar holds up against a barrel of oil since, say, 1970. Any of you economic eggheads out there have such a chart handy?
Oil quotes are priced in US dollars already, so you would need to identify what benchmark you want to use to compare oil and the dollar to.
Gold, market basket of food, price of a Chevy Impala, govt CPI deflator, etc