Where do I learn to manage a Mac OS Server network? I inherited a network with 2 Mac OS Servers and 20+ Macbook Pros. My background is all Windows server so I get the concept of Open Directory, Server Admin, and Workgroup Manager, but the nuts and bolts are more difficult to pick up.

Can someone recommend a starting point to learn all of this? So much of the resources I found out there are for home users and not necessarily for a work environment.
Ifskills has a great tutorial of Mac OS X Server. I'm still going through it myself. It is massively helpful.