Here is a list of useful Windows Operating System, MDT, ConfigMgr, and other OS Deployment resources...

Deployvista (My old Blog :)  ) - Despite the name, dedicated to all types of operating system deployments

Mike's (aka Deploymentbunny) blog - Mikael Nystroms blog

ConfigMgrFTW - Jason Sandys Blog 

Deployment Guys blog - A handful of deployment experts (MCS) are blogging here

Microsoft Deployment Toolkit Team Blog - The MDT team blog

Michael Niehaus blog - Nicknamed "Knowledgehaus" internally for his massive knowledge on deployment.

Xtreme Consulting blog - A few of the contractors on the MDT team work for Xtreme, this is their blog

Chris Nackers blog - Deployment Expert, working for Catapult Systems

Josh Mueller blog - Fellow deployment geek...

Maik Koster blog - Deployment Expert, Author, and Developer

Deploiement Windows - French deployment site (in French) hosted by Yannick Plavonil.

ConfigMgrBlog.com - Peter Daalmans blog