At SMWCon last week, Ms. Cicalese introduced the work that they've done at MITRE to set up a farm of MediaWiki installations that they manage for multiple stakeholders.
(She also found a problem -- CVE-2014-2853 -- that resulted in a new release of MediaWiki.)
I told her about this mailing list and asked her to describe the work she and those she works with at MITRE have done to support their farm.
Hopefully, this work will be helpful to others here.
Mark.