Server Fault's topic spectrum (from the FAQ) is intentionally both narrow and broad:
Server Fault is for Information Technology Professionals
Narrow -- We are only here for "IT Professionals", not hobbyists, enthusiasts, curiosity seekers, etc.
needing expert answers related to managing computer systems
Broad (encompassing networking, security, system administration, desktop support, etc...)
in a professional capacity.
Narrow - A restatement of the first bit.
Narrowing our scope further by pushing questions off to our sister sites diminishes the usefulness of Server Fault as a resource -- in fact we should be actively working to broaden the scope of the site (within the "for professionals" constraints I just mentioned).
Generally if someone is talking about doing something in a professional environment and it's no so esoteric that you really need an Apple, Ubuntu, etc. uber-specialist to answer it questions should be kept here.
The major exception is questions languishing in The Pit of Unanswered Despair -- If you can find these a