Here are my favorite resources for help and resources for MDT/SCCM. The folks that contribute to these sites are in my opinion are among the best of the best in Windows Imaging around the World.
Microsoft Deployment Toolkit Forum:
http://social.technet.microsoft.com/Forums/en/mdt
myITforum Blog:
http://www.myitforum.com
The Deployment Guys:
http://blogs.technet.com/deploymentguys
Xtreme Deployment:
http://deployment.xtremeconsulting.com
The D-Spot:
http://www.the-d-spot.org/wordpress/
DeployVista:
http://www.deployvista.com/
Mike’s Tech Blog:
http://itbloggen.se/cs/blogs/micke/
MSFN Board:
http://www.msfn.org/board/
TechEd Portal:
http://www.msteched.com/
Many Others are out there. If I missed any notables, please feel free to comment.