I have two Minecraft Bukkit SMP server instances on my host and I understand there's a default "world" included with each instance. I've read about multi-world support in future versions of Bukkit or Minecraft, but at the moment, I believe I'm stuck with a single "map" for each world.
Am I missing something or am I currently limited to a single world (and a single map) on each server?
AFAIK, there is no difference between "map" and "world."1
You can generate new maps/worlds for your server by renaming the "world" folder that is in the same directory as your server. When you start your server, it will see that there isn't a world named "world", and will create one.
1Note: There is now a map object in the game.
The world is the terrain around you, the actual blocks that make up what you see and interact with. A map is some 2D representation of the world (Aside: This applies to the real world too!). There are already programs to generate a variety of different maps, from straight top-down maps to cave-maps, isometric maps, etc.
In Minecraft 1.6 there will be a new map item which can be crafted to provide top-down mapping functionality in-game.
Bukkit does support multiple worlds, but as far as I know you need a plugin that implements this, such as MultiVerse or NetherGate. I suppose that it supports multiple worlds from a plugin developer's perspective; it doesn't do it itself out of the box.
Chances are it is referring to a 'world' as a space where people can play, and a 'map' as the terrain data which occupies said world.
