Johan Arwidmark has published some undocumented unattend.txt entries for unattended Windows installations.
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Recent versions of the Microsoft Windows Preinstallation Reference (ref.chm), which covers Windows XP and Windows Server 2003 include the additional [Components] entries which Johan identifies, but not the [Unattended] entries. For reference, the version I’m looking at is dated 10 August 2004 and ships with Windows PE 1.5.