Games TC's delay heat-map
The tube is only one way of getting around London though - there are buses, taxis, and bicycles for hire; all of which are presented in another Windows Phone 7 app, London Travel Live. This app gives you live information about tube train status, your Oyster card balance, live traffic updates, bus routes, and information on hiring bicycles.
London Live Transport
Additionally, there is an integrated Transport for London (TfL) journey planner, and live tile support for tube stations and bus routes. Fortunately, most information is cached for looking up when you're offline too.
London Live Transport Oyster infromation and live tiles
London Travel Live has a free trial and costs £0.79, as does Games TC. Therefore, give that London Travel Live gives you far more information and functionality for the same low price, it gets our recommendation as the app to navigate your way through Olympic London.