You could use one of the plugins that make you use a password before you can do anything, and next time you join you have to put in the password...
BOSEconomy support?
Thanks its now working, Awesome plugin
29/01/2011 10:17:23 AM org.bukkit.plugin.SimplePluginManager loadPlugins SEVERE: Could not load plugins\BasicCircuits-0.71.jar in plugins: null...
Separate names with a comma.