Is it possible to convert a vanilla world to a Bukkit multi-world? How?

I searched! Really! But this must be so simple I couldn't see it...

So, I'm looking for a way (a tool or an algo) to convert a world from a vanilla server to something Bukkit can use... and back. The "and back" part is not important right now, but it would be nice to have it.

The reason? The crafters on my server would be pretty angry if I destroyed their world ;( but I really want to switch to Bukkit because of some cool plugins which would make my life so much easier ;D

Also, I'm working on some kind of easier server hosting (for Minecraft) and being able to switch between vanilla and Bukkit easily would be swell...

 

Just install CraftBukkit and set the world to the current one, you can also use the MutliVerse plugin to introduce more worlds into your server.

 

mmmm. When I create a new CraftBukkit world, there's a few folders created: at least `world` and `world_nether`. Vanilla minecraft just makes a single `world` folder. I'm interested in converting from one structure to the other (both ways).

 

I've noticed this as well... however, it seems to work fine just dragging the vanilla world into your server and re-naming it "world." I would assume that any extra data in the folder would just be ignored by Bukkit, and it would instead create it's own two folders: one for nether (world_nether), and one for the end realm (world_the_end). I would like to know if there is a "cleaner" way to convert the folders, however.