I gave iMovieLocationEditor four mice in my review at Macworld, which is now online. I wrote:
The new Map feature in iMovie ‘09 taps a database of 4,000 cities, airports, and other locations. If the location you want to use isn’t in that list, version 8.0.1 of the software added the capability to enter your own latitude and longitude coordinates. But what if you want to use the same custom location several times?
One option is to find the text file (WorldLocations.txt) that stores all of the locations and edit it manually. A better approach is to use Craig Stanton’s iMovieLocationEditor. The utility edits iMovie’s text file faster than you can say, “I can’t remember how to open an application package.”