Bukkit

0.0.3
amount of inventories is configurable on permission node.
if  players have the permission "toggle_inventory.3", this means they have only 3 inventories.

0.0.2
bug fix for written books.
this version supports written books in 1.3.1 so the content won't be deleted.

0.0.1
Initial release

Not tested enough. In other words, your items can be lost.