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Integrit - file verification system

While reading an article to get you started on using a configuration deployment system that keeps all your servers configured in the same way, I read about the integrit file verification system.
It's a simple tool that fingerprints your file system when you yourself have finished with it and let's you know when and where changes where made. Either by a user with too many rights, or by a hacker, or by a runaway process in a badly coded script or any combination of the above. Bottom-line, you can use integrit to help detect intrusions, hackers or your own admins doing something they probably shouldn't (at least not without your knowledge!)

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