Is there a way that when someone clicks on the "bullion investing" forum there can be a display showing the current PM prices?
Here's another, if you like short- and long-term graphs: http://goldprice.org The left side is gold, the right side is silver; the labels are confusing.
For your smart phone, I suggest the Bloomberg app. Good way to keep up with all markets, including gold and silver.
It would be a nice addition to this site, but it would cost Peter a nice chunk of change to be able to put it here. With that information being readily and easily available elsewhere, it's really not worth putting it here.
The company or sponsor would need someway of measuring their results. I don't know how they would do that. You would need to go off this site to purchase. It would become lost in their daily sales. Then there is the problem of other companies trying to list their products as well. It could be a hassle for Peter rather than a blessing.