On the subject of Adblock, something I'd very much reccommend is switching from using AdBlock with a whitelist (where only sites in the whitelist don't have their ads blocked) to using AdBlock with a blacklist (where ads are only blocked on sites that you choose to block). For me, this is the best way to use AdBlock, since ads are far better and more relevant than they used to be. I rarely see ads that are truly obtrusive, an if I do, it's a simple two-click action to make them go away. Additionally, you actually end up finding out which sites use lots of ads in ways which annoy you, information which lets you make better choices about what sites you want to visit. So really, I recommend using AdBlock in blacklist mode only!
Too much work. I also use noscript, so ads are mostly broken anyway :P Another important think mk said was the no tracking part. I don't like to be tracked on the internet and using adblock in blacklist mode essentially tells them that you don't mind to be tracked, I also use ghostery by the way. Yes, I know. I am paranoid.