No dependencies required.
Simply place the .jar in the plugins folder.
Optionally add this line to bukkit.yml to organize worlds:
settings:
world-container: worlds

Example configuration file
# The search radius for a nether portal in the nether
NetherSearchRadius: 16
# The search radius for a nether portal in the overworld (Recommend to set it to NetherSearchRadius * Ratio)
OverworldSearchRadius: 128
# The search radius for portal creation. Make sure that it is smaller than the search radius.
NetherPortalCreationSearchRadius: 8.0
# The block to block ratio (1 block in nether = <Ratio> blocks in overworld)
Ratio: 8
# The height ratio (1 height block in nether = <RatioY> blocks in overworld)
RatioY: 2
# The name of the world the player teleports back to from the nether
OverWorldName: world
# The name of the world the player teleports to using a nether portal. If set to "personal", it will be a unique nether generated per player
NetherWorldName: personal
# The name of the world the player teleports to using an end portal. If set to "personal", it will be a unique end generated per player
EndWorldName: personal
# The height of the nether world. If using nether portals to teleport players to other worlds, make sure that it is set correctly.
NetherHeight: 128