Maybe all the worlds can be put on 1 map.
This way you will have an overview of the complete guildwars world.
Especially with Nightfall coming and future chapters, it'll be nice to see the complete world on 1 map.
It's easy to work with and it'll be cool to see everything on 1 map. Cool for yourself and cool to show to friends

The boats, wich are used to travel can still be maintained somewhere of course.
It's a small suggestion and I don't think it requires much time or effort to do this.
Grtz