That is why I keep using IE, and fighting the source, or at least defending myself against those jerks.
I too use, of course, adware, spybot and the likes, but I also pay ATTENTION the WHERE I am going on the net, as, however great those tools are, they are only effective AFTER damage is done.
AdWatch can prevent some, so can the google toolbar, but I do not blinly trust those either, as that scum will always find ways to bypass it, sadly enough.
As already said, I still prefer the full control of IE, then a crippled other one, just because of those jerks having nothing better to do then to try and invade my PCs.
Microsoft gets blamed for everything, I know, and I really think it is unfair too. But like you said, the day they either stop IE or lock it down 100%, other browsers will start to suffer. We'll see what happens then.
Shooting at a big tree is easier ... ;-)
Marc