In addition to what Duncan said, I'd recommend app-portage/cfg-update. It is non-interactive, and simply overwrites files that haven not been modified by the user, and leaves files that have well alone. This isn't always what's desired, but it can be a useful tool in some circumstances.
Tom -- Tom Martin, http://dev.gentoo.org/~slarti AMD64, net-mail, shell-tools, vim, recruiters Gentoo Linux
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