etc-update (in contrib) is your friend.
nice but not enough.
What's missing is the diff between the previous default config and the user modified config (so that it's easy to spot what the user has changed), and a diff between the previous default config and the rpmnew (so it's easy to spot the differences introduced in the config file).
Bye -- Luca Olivetti Note.- This message reached you today, it may not tomorrow if you are using MAPS or other RBL. They arbitrarily list IP addresses not related in any way to spam, disrupting Internet connectivity. See http://slashdot.org/article.pl?sid=01/05/21/1944247 and http://theory.whirlycott.com/~phil/antispam/rbl-bad/rbl-bad.html
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