The latest Demos newsletter pointed out a website that combines at least three hot recent trends: the use of digital media to organize and navigate the city, environmental consciousness and the attention for health and obesity issues: Walkit.com is a site that’s lets you plan walking routes between two points in London, Birmingham and Edinburgh, and at the same time informs you how many calories you’ll burn as well as the amount of CO2 that is avoided.

Demos see the site as part of ‘a need for a New Urban Commons: shared tools and resources that can improve our cities and our experience for them.’ The think tank is ‘developing a new project asking who is creating the New Urban commons, how can civic authorities encourage its growth and where is it growing fastest?’