Well, as I've mentioned a few times, I view the Swiss situation as a similar one to the Norwegian one. Through an accident of fate, but also due partly to the way they have managed things, both of these countries find themselves in situations where they have something that other people really want (safety and oil). Their governments end up sitting on very large pools of money which need to be invested. That money, with the income that it has earned, can subsequently be used to either shore up finances when the situation changes (like Norway is doing now) or distributed to citizens (SNB does a bit of that every year by paying a dividend to the cantons). SNB, just like Norges Bank, is more a sovereign wealth fund now than a central bank. When/if the time comes to unwind, they can simply sell whatever share of their FX reserves is needed to normalise and reduce the size of their balance sheet. This, incidentally, is what the Danish central bank (another pegged currency) has been able to do.
As to my thinking about it being "normal", I think you have to put things into proper context. The European integration project is an unprecedented undertaking. Nothing around it is "normal", but in the grand scheme of things, compared to all the other dramas unfolding on the continent, no, I don't think the SNB's actions are such a big deal.
