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I have new rules of Castling, that conform to standard chess castling but
could be used for any variant where the back row included a king and at
least one rook.  (For example Fischer Random, Double Fischer Random, or
Shuffle Chess)   I present them here for discussion:

Castling
This is a move of the King and either Rook of the same colour on the same
rank, counting as a single move of the King and executed as follows: the
King is transferred from its original square two squares towards (or over)
the Rook, then that Rook is  transferred to the square the King has just
crossed (if it is not already there).  If the King and Rook are adjacent
in a corner and the King can not move two spaces over the Rook, then the
King and Rook exchange squares.

(1) The right for castling has been lost:

   1.  if the King has already moved, or
   2.  with a Rook that has already moved 

(2) Castling is prevented temporarily

   1.  if the square on which the King stands, or the square which it must
cross, or the square which it is to occupy, is attacked by one or more of
the opponent`s pieces.
   2.  if there is any piece between the King and the Rook with which
castling is to be effected.