There's one ad that I see a lot (IRL), and that's an anti-speeding ad. The ad shows an officer and in his glasses you can see cars. The ad has a caption, "Speeding? You're in our sight".
Eye in the Sky is based off this, sorta. EitS is a plugin that's all about logging. Logging blocks, logging chat, logging just about everything a player can do.
Eye in the Sky is a simplistic, yet complete, logging plugin in the making. EitS aims to provide a complete analysis of what happens with players, so that in case of an outbreak, or someone complaining, there is appropriate evidence
Logs are stored in a sub-directory called "logs". Each player has their own .log file, which details for every event:
There are no commands, permissions or configurable elements yet, however some are planned. When added, you'll know about it!
<DISCLAIMER> Large servers may experience some lag when events are 'fired', or run. I'm looking into optimising the code constantly</DISCLAIMER>
Simply download the plugin! It's designed to be as light-weight as possible, yet still being complete, so at the moment you don't need to worry about configuring anything!