I had a problem with this once before... many months ago. Having no idea what was going on, I just did what I do everytime I manage to screw things up (I'm quite good at that ).

Now, in order to prevent it from happening again, because I might one day hit a site that redirects to it, what urls / ip addresses do I need to block? Will blocking the ones listed at the bottom of the page you linked to on google do the job?