This one has been installed because SimpleCensor didn't want to work.

It allows you to invoke various actions upon users if they swear, not only censoring them but deterring them from continuing to swear. Examples include striking with lightning, kicking, and sending the user to a defined jail.

On the VR server, users are struck with lightning.

http://dev.bukkit.org/server-mods/chatcensor/

I hope it doesn't do the thing that SimpleCensor did and pick up the contraction of "who" and "are."

Also, I wonder if this could be used as a griefing method.

I don't believe it actually damages the ground.