Thanks very much, Rudi, for the very detailed answer.
<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by Rudi:
2004 sticker (good from dec-1-2003 through jan-31-2005) costs SFr 40.
can be bought at 'any' petrol-station, post-offices, and also, when entering Switzerland on a motorway, right at the entrance/immigration point.
fine for not having it attached to your windshield, while running on motorways, is SFr 100.</font>