Wish it had bothered to ask me permission.
I usually visit MacRumors from my PC at the office (I get too lonely for my Mac otherwise). And yes, I have my IE set not to download anything without permission and to use reasonable security. I also use a mostly successful popup blocker, so I was unpleasantly surprised to find the MacRumors front page sporting a pop-up ad. And I did notice that it was taking a long time to load, but I'm used to dial-up at home so I didn't think that much about it.
So imagine my surprise 15 minutes later to find my browser unusable and my hard drive full of porn sites. Looks like the Lycos Sidesearcher malware. Also looks like my time at MacRumors is going to drastically decrease if I can't safely visit from the office.