It's very easy to install, you just have to flush a weighted cable through your toilet and about an hour later one of Google's PHDs (Plumbing Hardware Dispatchers) will be able to connect the cable to the nearest TiSP Access Node. Full installation instructions over at Google.
Google TiSP (BETA) is a fully functional, end-to-end system that provides in-home wireless access by connecting your commode-based TiSP wireless router to one of thousands of TiSP Access Nodes via fiber-optic cable strung through your local municipal sewage lines.Yet another nice April Fools' Day joke from Google