Jacob Salmela has created a new version of Raspbian called ‘Pi Hole’. The operating system has been designed to be a DNS-server which blocks ads for your entire network. All you need to do is download the image, install it on an SD card and then point your home devices’ DNS settings to it. It seems quite a sophisticated system with a proper web GUI. Please just remember that ads on many sites are only there so that they can afford to run, so white-list those sites that you like! A full guide to installing it is available on Lifehacker.