Glad I'm using Linux right now.
Nice! I thought to myself recently "is there a browser that stops all of those dodgy scripts that no one cares about which are mainly used to spread spyware?". Guess I've found an answer :-)
It is rather nice. Mildly annoying when you go to sites that need it the first time, but you get through your common ones pretty quick and then it's completely innocuous.
IETab is also very handy - for those sites that refuse to give in to the fox.