Honestly, I would only look at Gold (not Silver, BTW), as a portfolio hedging instrument. The reason for it is basically a crisis of currency valuations: Euro vs USD, Yen vs USD, etc. In contrast, Silver is just another commodity, like Copper, Nickel, Corn, etc. Yes, all commodities go up against a collapsing currency (see Argentina, some ten years ago, or Zimbabwe for a more spectacular debacle) but the USD is nowhere near those scenarios despite all the current economic & political hacks in charge.
With that in mind, buying physical gold requires a relationship with a depository service. On the other hand, the EFT is a virtual way of doing something similar but of course, you're trusting the ratings, auditing, etc, of the securities vendor there.
What the typical investor does is place let's say 10% to 15% of his portfolio in gold. I did that sometime back and I made 200% yield on it (thus giving the overall portfolio, a nice booster) but now, I don't feel the need to add to it, until the end of the next major dollar rally which will then retest gold's low point again. Usually, if gold doesn't develop another bearish signal, at the end of a dollar re-strengthening, it might not be bad to add a small bit, just to make sure that the overall portfolio is still within 10-15% of the total. All and all, I suspect that Gold is in a temporary bull run. I don't expect it to double at this point, $1K => $2K, since debt deflation is currently under way but since it does serve as a monetary alternative, it might not be a bad idea to have a bit, just in case.