I installed the Adblock add-on for Firefox 2, and it works great! You can easily block all ads, scripts, trackers etc that lurk behind just about every website, which improves surfing speed no end. This is especially useful for those using 3G connections - as well as the increase in page loading speeds, it also saves you valuable data kb's 8-) A word of warning if you're using Firefox3 - apparently there are compatability issues at the moment.