ForeverMap brings maps of every location in North America to your iPhone, iPod touch or iPad. The US$0.99 app lets you decide which maps you want, such as a state, a whole country or a province, and download what you need. Maps can be downloaded through iTunes or on Wi-Fi, but not on 3G. You can delete or add more maps as you wish, the only limitation being storage on your iDevice.
The maps are sourced from OpenStreetMap.org. The advantage of the app is that you have the maps with you without any data connection needed. You can plan a route, find a nearby restaurant or museum, or find an address without ever being connected to the internet.
The routes you plan can be for walking or driving, but the app does not give you turn-by-turn directions. It will show you as a moving icon on the map if your device has GPS. There is a bookmark function and filters so that you can select what you are looking for that might be nearby.