Resources for learning Linux Admin in large organizations

A little background here:  I’ve been doing administration of Windows networks and enterprises and now have been consulting for a long time setting up enterprise management systems, mostly focusing on Windows (client and server).  I’ve been running Linux desktops for a long time at home.

Rambling intro to get into the point of this post but what I am really looking for are some good resources (books, web pages, examples) on learning about administration at an enterprise level.

Customers that use Linux in the Enterprise have more experience than I do and I want to learn.  How do you create and manage local repositories?  How do you do scripted OS installs for multiple computers?  What other tips, tricks, ideas, do I need to learn?

Good books?

 

Thanks in advance