There was recently a huge discussion in Germany about ad block that website users installed in their browser to not see any ads. Some publishers united and asked their visitors to switch off adblock.
I also thought about doing so, but I am a number person and love to base my actions on facts. So I created a counter for ad block users that tells you how many of your visitors actually use adblock. In my case the number was much lower than expected, so I can spend my time on something else. Anyway, I developed it as a WordPress plugin and uploaded it to wordpress.org to be downloaded for free. I would love to get your feedback on it.