What is the longest (farthest) distance from the goal that a header
has been scored?  The match and player please?

I'd say this is it:

From: UK Newsquest

"And what about Allistair Lang's extraordinary record, achieved while
he was playing for Northbank against Spittal Rovers in the Northern
Alliance League in September 1998? Allistair scored with a header from
60 yards! The FA told the 22-year-old that their records showed that
the previous longest scoring header was 35 yards, by Peter Aldis for
Aston Villa against Sunderland in 1952."

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Clarification of Answer by davidsar-ga on 13 Jun 2002 14:56 PDT

Hello there.  

I'm afraid I forget to give you the specifics of where this article is
from.  It was in the November 23, 2000 edition of UK Newsquest, a
British publication.

Since I accessed it from non-internet sources, there is no search
strategy to speak of.

Hope it was what you were looking for.