Customizing WinPE 2.0

Windows PE 2.0 is the core deployment foundation for Windows Vista. It is designed to make large-scale, customized deployments of the new Windows Vista operating system notably easier. When Windows Vista launches, Windows PE 2.0 will be available to all Windows Vista corporate customers. [Windows PE for Windows XP will remain exclusive to customers who have a Microsoft Software Assurance (SA) agreement.] Windows PE enables users to inject drivers, configure Windows Vista offline, provide recovery solutions as well as diagnose and troubleshoot system problems. ..

This is nice presentation (Customizing WinPE 2.0)
http://download.microsoft.com/download/5/C/D/5CD434E6-9A62-48BE-8734-CAB7E9915B04/Vista%20Deployment%20-%202.ppt

Source: microsoft.com