With oil's decline and natural gas' rise over the past few weeks, the ratio of oil to natural gas has declined quite a bit. As shown below, the oil/natural gas ratio hit a 20-year high recently as natural gas collapsed. The ratio is still very high compared to historical levels, but it is down from 27 to 17 since the start of the month.
The platinum to gold ratio has also begun to reverse the downtrend it had been in since early 2008. At the end of 2008, gold actually traded above the price of platinum, bringing the ratio below 1 for the first time in years. With the economy getting back on track, platinum has outperformed gold, and the ratio is back up to 1.28. This is still, however, far below the range that the ratio was trading in throughout most of this decade.