In article ,
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I have a Specialized Allez alluminum frame and am thinking about getting a
carbon fiber fork for it. I have seen forks with cro-moly steering tubes,
alluminum steering tubes, and carbon fiber steering tubes. Are there any
differences as to strengh and durability?

No differences because of material alone. I would go by the reputation of
the manufacturer.

Also, if I decided to get a fork
with a carbon fiber steering tube, does it require a special headset (the
frame
is not built for an integrated headset).

Normal headset will work on most. Very few CF forks are made for integrated
headsets.
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Alex