one can do this with maemo mapper already, iirc. The only thing i think this tool brings would be the extra number of map sources and the ability to mark a area to download by dragging a box.

still, after checking the program out i am impressed by its selection of sources. Especially that it has topomaps from the norwegian national surveyor. Not sure what would be simplest tho, getting it to support maemo mapper, or get maemo mapper to support one of the already provided formats.

btw, i wonder if it works with navit...