If you put all four metals on a one month google chart, PALL is up 22% PPLT +16% slv + 14% and GLD up about 2%. Palladium is the stand out lately.
http://www.kitco.com/market/us_charts.html
google
http://www.google.com/finance?q=pall&ei=kzeaV4jcGJa9e8C0gMAE