Johan Arwidmark has a new post discussing the Role and Features action inside MDT.
One of the most powerful features in MDT is the option of having the Task Sequence install all the Roles and Features needed, most often on servers, but also for clients. I use this feature heavily in different kinds of automated datacenter builds and when preparing Proof-Of-Concept or other demo/lab type environments.
How does Install Roles and Feature action work?
Explanation of the (Win7), (2008R2) and (Win7,Core) entries
Windows Server 2008 considerations