Badges update automatically and link to the plugin page on MineUniverse.
It allows you to build a jail however you like and gives the commands to throw a player in jail for eternity or a set time. It prevents placing/breaking of blocks and usage of just about any item while jailed. It stops commands being used, except the /jail command (so they can see the time they have left with /jail info). It also (optionally) stops chat. Fully complete with permissions.
When a person is jailed, they are teleported to a set of coordinates. When they are set free, the plugin executes the command(s) that are in the config to do whatever you wish (by default it does /spawn).
The commands are found at http://dev.bukkit.org/server-mods/simplejailr/pages/commands/
The config is found at http://dev.bukkit.org/server-mods/simplejailr/pages/configuration/
Permissions are found at http://dev.bukkit.org/server-mods/simplejailr/pages/permissions/
If you'd like to donate, I have a link for that.
Thanks for keeping me motivated! :D