Platinum (Pt) and palladium (Pd) are two interesting precious metals (actually all metals are interesting, maybe I should have studied Material Science rather than Geology and Business).
Barron's (the financial newspaper that comes out on weekends) has a good article in their "Commodities Corner" column there in the Market Watch section. Those of you who are interested might want to check it out. Barron's has an online edition, but I do not know if it is free.
Pt is used in jewelry (the white crown that holds the diamond in a ring is usually Pt) as well as a catalyst (industrial and automotive catalytic converters) as well as investment demand (me).
Pd is an interesting metal too. Pd is permeable to hydrogen gas, that is hydrogen can go through Pd, but no other gas can! This could be very useful in upcoming green technologies, especially if they wind up using hydrogen in vehicles. Pd can hold 900 TIMES its volume of hydrogen. Pd is used some as a catalyst,but apparently does not have as wide a range of uses as Pt does. Pt, for example, can be used in diesel engines as well as gasoline engines. Pd cannot (yet anyway) be used in diesel engines.
"Sometime" I will get around to writing more on platinum and palladium. Unless I can con an expert (like virtual friend T.M. for example) to do a Guest Post... :-)