WAIK 6.1.7100 (Windows 7 RC)

The Windows® Automated Installation Kit (Windows AIK) is a set of tools and documentation that support the configuration and deployment of Windows® operating systems. By using Windows AIK, you can automate Windows installations, capture Windows images with ImageX, configure and modify images using Deployment Imaging Servicing and Management (DISM), create Windows PE images, and migrate user profiles and data with the User State Migration Tool (USMT). Windows AIK also includes the Volume Activation Management Tool (VAMT), which enables IT professionals to automate and centrally manage the volume activation process using a Multiple Activation Key (MAK).

dism /mount-wim /wimfile command is NOT WORKING in version 6.1.7100 !!!
You have to use ImageX

1. create winpe.wim image
cd "c:\Program files\windows aik\tools\petools"
copype.cmd x86 C:\winpe_x86

2. mount image
imagex /mountrw c:\winpe_x86\winpe.wim 1 c:\winpe_x86\mount

3. change scratchspace
dism /image:c:\winpe_x86\mount /Set-ScratchSpace:512

4. add your applications etc.
add them to c:\winpe_x86\mount

5. dismount image
imagex /unmount c:\winpe_x86\mount

6. make iso file
copy c:\winpe_x86\winpe.wim c:\winpe_x86\iso\sources\boot.wim
c:\progra~1\windows aik\tools\x86\oscdimg -n -bc:\winpe_x86\etfsboot.com c:\winpe_x86\iso c:\winpe_x86\winpe_x86.iso

Download:
http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=60a07e71-0acb-453a-8035-d30ead27ef72

Documentation:
http://www.microsoft.com/downloads/details.aspx?familyid=F1BAE135-4190-4D7C-B193-19123141EDAA&displaylang=en