This plugin logs every block a player breaks/places and sends a message to the console saying:
[Info] <Player> Placed a <Block Name>
==ScreenShot over the Console==
As seen here It gives the console an message when a player places or breaks a block.
There's no commands yet and the only one that gets messages is the console.
THIS PLUGIN DOESN'T ROLLBACK BLOCK SO JUST ANOTHER PLUGIN IF YOU WHANT TO ROLLBACK GRIEF!