WPKG Wiki
WPKG is an automated software deployment, upgrade and removal script for Windows.
It can be used to push/pull software packages, such as Service Packs, hotfixes, or program installations from a central server (for example, Samba or Active Directory) to a number of workstations.
It can run as a service to install software in the background, without user interaction.
It can install MSI, InstallShield, PackagefortheWeb etc. packages, and all other packages using repackaging or some batch scripting (see FAQ for details).