Just a quick note to point out that there are two new blogs focused on MEP! I've added a new category to the sidebar for Revit MEP blogs and you'll find these there.
Inside the System - Kyle Barnhardt (Autodesk Revit MEP Product mgr)
Revit MEP Blog - Scott Brisk (MasterGraphics, Reseller)
Both have lots of great info and worth keeping an eye on.