New download called Windows Automated Installation Kit just showed up on Downloads. According to its description:
Use this tool to configure unattended setup answer files (Unattend.xml) and capture images.
It support Windows 2003/XP/Vista. There is nothing more what I can tell You about it just now, I will have to test it and see what it can do.
Everybody who used it or will test it is more then welcome to share expirience through comments to this post.