amusing that I made the quote this week. I meant it sincerely. The person I was replying to suggested storing all the pkg info per-system so when you reinstalled you could get back to the set of pkgs you had before really quickly. I was telling him that you mostly need the list of pkgs and the list of repos on the system and you could figure everything else back from there to fetch down the right set of pkgs.
you just need a good place to save this data to make it easy for the admin/user to retrieve later when they reinstall/upgrade their system.