Well I just found a Platinum thread 5 months back, and no Palladium thread at all!!
Well Palladium has just broken above $400 for the first time in few years is looking strong too.
A couple of background articles -
The Case for Palladium
Platinum - Dark Horse Bright Future
Much of what is said about Platinum also applies to Palladium which used to be the more expensive of the two. They are can both be used in catalytic converters, and the high price of Pd a few years back caused the cheaper Pt to be substituted. I think we might see a reversal again, since the prices have reversed.