Here is some informations about World in a Jar Map for Minecraft Frostburn that you can need before download it.
World in a Jar Map Screenshots:
Animal Jars
NPC Village!
Mushroom Biome!
All Jars!
Adventure jar #1!
Desert Jar!
PVP Arena!
Empty Jars!
Jungle Jar!
Maze Jar! Super Hard!
World in a Jar Map Challenges:
Download links for World in a Jar Map:
http://www.mediafire.com/download/ay6lrdwul207jyb/World+in+a+Jar%284%29.zip