It's hard to Google this because it seems like everyone and their kid sister has written a script to gather system stats!
I once saw a mature program written that is used to gather system stats like installed packages, listening ports, users, partition information, etc. and dumped everything into one nice YAML (or was it JSON?). I was really impressed by how comprehensive it is.
I forgot what it was called, and now I have a need for it. Can you think of any mature programs available that does this? I'm not looking for a monitoring system or leveraging Facter; I just need a report of a current system as whole-circle as possible.