How do I create multiple worlds?

Solution 1:

You want to use Multiverse:

• Create multiple worlds of different types, seeds and with Custom Generators
• Create portals to let users go between other portals, worlds, or locations
• PermissionsBukkit support (Anything that implements the superperms api - GroupManager does I think)
• iConomy, BOSEconomy, RealEcon, Essentials Econ and Item economy support!
• Show which users are in what worlds
• Create portals to let users go between worlds
• Control who can enter worlds/portals with permissions!

Solution 2:

An alternative to Multiverse is My Worlds. I've always found it to be more stable and less lagy. Currently doesn't support 1.5.* but only because BKCommonLib is being slack at updating. I would suggest using Multiverse until BKCommonLib updates and then switch.