expbottles is a plugin for Bukkit which allows players to bottle EXP into glass bottles, to create Bottles O' Enchanting.
This allows users to preserve EXP for later, prevent EXP loss on death, and allows users to use EXP bottles as a currency.
Currently, you must build expbottles yourself to be able to use it.
Simply drop the latest .jar into the /plugins directory of your server.
TBD