BetterEnderChest

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This build requires Minecraft 1.5.1 for the server, any other Minecraft version, older or newer, won't work.

When uninstalling: players will lose their items. If you weren't using an inventory seperation plugin you can use the converter to convert back.
You have to manually enable the importing form multinv, worldinventories and multiverse-inventories. The plugin never writes to the original player files, so you can remove the chests directory (plugin folder) to start the importing process again.
This build will work on Minecraft 1.5.1 servers only.

Bukkit Plugins