Given that alot of N900 owners use Linux on their desktop computer as well, and that trying to pre-load maps is difficult without a windows or Mac PC, the download map functionality should be built into the Ovi Maps software.
The Ovi Maps application should have functionality similar to Nokia Map Loader in the settings of the program which allows the following:
Downloading of maps by region
Selection of storage device for downloaded maps
Ability to check for map updates
Ability to erase maps by region
