http://www.winbuilder.net/news.php
WinBuilder, a program that helps you to build and customize Live
CDs. It's similar to tools like BartPE.
A PE environment is actually a lightweight version of an OS.
Specifically, from XP onwards.
It allows you to recover your system if it crashes (LOL...
DOS-based tools are a bit limited and that's where GUI comes into
good use).
Those who suck at DOS will find this useful. It's like booting
up to a Linux CD, copy all the things you need and reformat. For
the more technically advanced, you can do repairs to a PC without
having to resort to reformatting and reinstalling a system.

Those who have used ERD Commander before (used to be from
Winternals before MS bought the company) , then you've used a PE
environment.
A little more info - http://en.wikipedia.org/wiki/Windows_Preinstallation_Environment
Going to try my hand on the Vista version. Looks challenging.
