Here's a rather rather cool idea from the TomTom folks. An update available today to the TomTom iPhone nav apps (price varies depending on countries covered) allows you to edit the information on your maps and then submit those changes for others to access using what TomTom calls Map Share. This feature is also present on many dedicated TomTom GPS units.
Map Share lets users edit street names, set driving directions, and block and unblock streets directly on the maps, and then share those changes with the TomTom community. Once the changes are verified, everyone gets updated maps. The updates come automatically once a week, o