Better known as a Swiss Museum Passport, should be one of the must gets if you are planning a trip to Switzerland. In just 3 visits within 1 single month, your pass will pay for itself. I'm guessing most museum costs are about the same, so by paying 30CHF for the pass, it is well worth it's weight in gold.
You can get a Swiss Museum pass, (Schweizer Museumspass, Passeport mussees suisses, Passaporto musei svizzeri), adn the little booklet giving addresses and opening times from larger tourist offices, branches of ticket corner and the ticket desk of any museum in the scheme. They all display a sticker too! This will give you entry to over 300 museums!
Check it out at www.museums.ch/pass