Personal sat nav

Hot-footing it between meetings in the central areas of most cities can be a real heart-in-the-mouth experience if you aren't sure of your route. I found myself stuck the other day and used Walkit. I plugged in the two post codes and ended up with a series of alleys and cut-throughs in central London that I'd never have worked out on the fly. You even get a calorie burn and the satisfaction of knowing how much CO2 you saved against alternative transport.