Windows PE is a fully-functional (though scaled-down) version of Vista, and as such you can modify it using scripts and other techniques. One popular modification is creating menus in Windows PE to ease the task of deploying Vista. To make doing this even easier, check out PMenu, a third-party tool that makes it easy to create menus in Windows PE.
Mitch Tulloch was lead author for the Windows Vista Resource Kit from Microsoft Press, which is the book for IT pros who want to deploy, maintain and support Windows Vista in mid- and large-sized network environments. Mitch was also the author of Introducing Windows Server 2008 and technical project lead for the Microsoft Office Communications Server 2007 Resource Kit, both books also from Microsoft Press. For more information on these and other books by Mitch, see www.mtit.com.