Faf,
just got back from the blackforest and a visit to Switzerland. You will need to buy a vignette <sp> to use their motorway network. They are available from the service areas before the swiss boarder and will cost you 28 euro's or ?18.50. They are valid untill the end of 2005 and have to be stuck to your bike to be valid. If its not stuck on and they stop you you will be liable to a fine. Saying that they gave the bike a good look at as we entered the country to check the sticker but after that nothing. Hope that helps mate.