Source Code for Microsoft Deployment Toolkit (MDT) 2008 is available for download

Bart Bultinck — Tue, 13 May 2008 06:42:36 GMT

The source code for Microsoft Deployment Toolkit (MDT) 2008 is available for download by customers and partners who want to make modifications, enhancements, or bug fixes to MDT’s components. The source code is provided separately from MDT 2008, which contains all guidance, scripts, and tools. Microsoft Deployment Toolkit 2008 is the recommended process and toolset to automate desktop and server deployment.
The MDT source code is not designed to be used as a stand-alone component because it contains only the source files not included in the MDT release.
The source code file will install into a separate directory and will not overwrite the original source to permit inspection of the differences and avoid disturbing any customer modifications to the original source code.
This source code is being provided as is, with no support, and it can be used as specified in the included license terms. It is current as of the March 2008 release of Microsoft Deployment Toolkit 2008. However, development is continuing on Microsoft Deployment Toolkit and future design changes likely will require anything from reintegration to complete reengineering of the customizations made to the source code.
get it here

yummie ! (source : http://blogs.msdn.com/dsebban/archive/2008/05/12/le-code-source-de-microsoft-deployment-toolkit-2008-est-disponible.aspx )

//Bart

VISTA SP1 : you can't slistream SP1 into an existing install image

Bart Bultinck — Sun, 10 Feb 2008 10:55:11 GMT

BAD news you think , not really : you can't just do an offline upgrade to an image .WIM file because the servicing layer also needs an update.
solution: recapture the image using the latest version of the WAIK

Scratch The Surface : WAIK

Source Code for Microsoft Deployment Toolkit (MDT) 2008 is available for download

VISTA SP1 : you can't slistream SP1 into an existing install image