Windows Phone 7: Back in March 2010 we featured NeatStreets, an app which lets you report issues in your community such as broken street lamps directly to the local council or other relevant authority. Both the Android and iOS versions of the app continue to evolve, and there's now a Windows Phone 7 version as well.
The basic concept remains the same across all platforms -- reports are automatically routed to the relevant body by using your GPS location to determine who is the right recipient -- but the WP7 version adopts the interface to good effect.
NeatStreets is a free download. NeatStreets [Windows Marketplace]