This website from Futurelab describes itself as a “fun and easy way to explore any topic [...] Power League is a versatile resource that lets you ask tough questions, stimulates debate and creates a visual league table based on votes gathered across your group.” Essentially you choose a question, for example, “Which is the bigger cause of climate change?”and set up a league. Students are offered a series of random choices between two people or things, e.g. Deforestation and Farming, each backed up with a link to more information. After they’ve made a number of choices you can view the league. Currently in the World Power League (“Who do you wish had more power?”) Albert Einstein is top of the list, Michael Owen second from bottom.
This ideal for use in English, Citizenship, Geography, History, RE and indeed any subject that asks students to make decisions about aspects of what they are studying and be able to debate why they made that choice. The website includes a number of lesson plans.