Je ne sais pas if this the right tool for you, but heise sécurité has a nice solution for packaging Windows Mises à jour:
DIY Service Pack - Installing Windows updates without an internet connection
Looking for manageable Windows mises à jour
even sans an internet connection?
Our offline mise à jour 3.0 script
collection downloads the entire body
of mises à jour for Windows 2000, XP or
Server 2003 from Microsoft's servers
in one fell swoop and ensuite uses them
to créer patch packages on CD, DVD or
USB stick. Those in turn allow you to
mise à jour as many PCs as desired.
Mise à jour : Windows 7 support is just a matter of time, I think. See this forum post.
Mise à jour 2:
New wusu offline update here Supports Windows 7 and 8
