Easy to use and flexible tile map editor.
Tiled is a 2D level editor that helps you develop the content of your game. Its primary feature is to edit tile maps of various forms, but it also supports free image placement as well as powerful ways to annotate your level with extra information used by the game. Tiled focuses on general flexibility while trying to stay intuitive.
Works great. Saving must be done to the Home/localsync directory, but definitely works.
Tiles really work!