Quoting from the "Features" page for the new EGCS C++ compiler (1.0)
(see <http://www.cygnus.com/egcs/c++features.html>):

  (void *)0 is no longer considered a null pointer constant; NULL in
  is now defined as __null, a magic constant of type (void *)
  normally, or (size_t) with -ansi.

So there is hope after all of achieving a "common practice" for using a
real null pointer in C++.
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