If you view http://www.vg.no/ (the biggest site in Norway and my employer) using Internet Explorer 6 or older you will get a message urging you to upgrade to a newer version. We also provide links to Firefox, Opera and Google Chrome.
finn.no (among the top 5 sites in Norway) also does this. I got a request from Finn’s Erlend Schei about this on Twitter yesterday and got the “GO” from our CEO earlier today to make it happen.
More sites will follow this example later today.