Some tools I have found very helpful in blocking inappropriate content are Adblock Plus and Remove It Permanently I never see ads when I’m browsing the web when Adblock Plus is installed (unless my web-browser update breaks the plugin…) Remove it Permanently is very useful for websites with distracting/annoying/innapropriate sidebars, etc… You just right-click on the annoying element, and RIP, and it should be gone forever!
P.S. I’m working on another GIMP tutorial, but I have no idea when I’ll get it done. I’ll post here if/when it’s done. 🙂