Just a note to anybody who stumbles across this thread later on, the "Map" application doesn't fail gracefully if its settings and/or map database is corrupted. If this is the case, it will crash as it's opening. This happens if the map download gets interrupted for whatever reason.

The way to solve this is to remove the map folder on the internal memory card and redownload your maps.

krisse, it may be worth putting up an article on this, as it's a fairly common occurrence.