I'm pretty late to the game but I just downloaded the AdBlock extension for Chrome, which I use both at home and the office. I'm only 72 hours in and have realized a significant difference in my web browsing experience, hammered home by being able to see how man ad's have been blocked (currently at 5,243). Needless to say I couldn't be happier. The removal of ad's from the web creates a much cleaner, less frustrating browsing experience, which I highly recommend everyone try. What are the ramifications of AdBlock though? What happens when enough people download it and no longer have to look at the endless barrage of ad's on virtually every page they visit? I anticipate, to the dismay of the Google's Facebook's and Yahoo's of the world, that this will occur in the not to distant future and force us to rethink how we monetize the web.
Obviously we should all be at least a little thankful for web marketing, being that it has made virtually the entire internet free to anyone who can access it. But like everything else in life there is always a tipping point, and I expect that with services such as AdBlock we will have to rethink how we monetize the internet at a fundamental level. Furthermore, at a certain point I think we can all agree that there will just be too many ad's for us to consume, no matter how targeted to the individual they are. Maybe it won't matter at all with the explosion of mobile apps, but I don't expect that to be the case in the short to mid term. PC sales are up and I personally can't imagine ditching my MacBook for quite some time.