We got the request and we went to the bottom of the problem.
iCurrency Plus now officially supports precious metals; specifically Gold, Silver, Platinum and Palladium.
Needless to say, you can see the prices of those metals in the currency of your choice
Of course, we just started to collect data, so historical records and graphs will be available soon.
With this request, we have added 20 currencies since we launched the application in the middle of January 2010. So please, feel free to requests the currencies of your choice!