For anyone travelling through or visiting Switzerland, up to now, the swiss motorway toll was paid by buying a sticker. Now there is the possibility of registering your license plate and paying online, avoiding the need to buy a sticker. 40 francs for a whole year - not bad compared to other countries.
You register by going to the official site, e-vignette.ch, also in english.
Beware of third party sites, they do exactly that, but charge you for the procedure.