Adblock Plus is one of those application enhancers that kind of straddles the line for bloggers/web developers and their readers. It can help you keep offensive junk away from your kids’ sensitive eyes, protect your computer from having the kids (or not-so-savvy-users) click malicious ads, and simply cleans up some rather junky-looking sites. But it can also drive down the potential ad-generated revenue of some very deserving sites.
I suggest downloading it, installing the default filter set and then customizing it to trust those sites that you visit often or want to help support by allowing their ads. You won’t regret how much better the web looks without all those annoying ads everywhere!