The following packages appear to be using gnulib and gnulib-tool:

  CSSC            http://git.savannah.gnu.org/cgit/cssc.git
  Net::CDP        http://search.cpan.org/src/MCHAPMAN/Net-CDP-0.09/libcdp/
  OPeNDAP         http://scm.opendap.org:8090/svn/trunk/
  anubis          http://cvs.sv.gnu.org/viewcvs/anubis/anubis/
  augeas          http://augeas.net/
  autobuild       http://josefsson.org/autobuild/
  bison           http://git.sv.gnu.org/gitweb/?p=bison.git
  clisp           http://clisp.cvs.sourceforge.net/clisp/clisp/
  coreutils       http://git.sv.gnu.org/gitweb/?p=coreutils.git
  cpio            http://cvs.sv.gnu.org/viewcvs/cpio/cpio/
  cvs             http://cvs.sv.gnu.org/viewcvs/cvs/ccvs/
  diffutils       http://git.sv.gnu.org/cgit/diffutils.git/
  febootstrap     http://people.redhat.com/~rjones/febootstrap/
  findutils       http://cvs.sv.gnu.org/viewcvs/findutils/findutils/
  gcal            http://git.savannah.gnu.org/gitweb/?p=gcal.git
  gettext         http://cvs.sv.gnu.org/viewcvs/gettext/gettext/
  gnuit           http://www.gnu.org/software/gnuit/
                  http://git.savannah.gnu.org/gitweb/?p=gnuit.git
  gnutls          http://cvs.gnupg.org/cgi-bin/viewcvs.cgi/gnutls/?root=GNU+TLS+Library
                  http://git.sv.gnu.org/gitweb/?p=gnutls.git
                  http://repo.or.cz/w/gnutls.git
  gpg             http://cvs.gnupg.org/cgi-bin/viewcvs.cgi/trunk/
  gsasl           http://git.sv.gnu.org/gitweb/?p=gsasl.git
  gss             http://git.sv.gnu.org/gitweb/?p=gss.git
  gtk-vnc         http://gtk-vnc.codemonkey.ws/hg/outgoing.hg
  grep            http://git.sv.gnu.org/cgit/grep.git/
  guile           http://cvs.sv.gnu.org/viewvc/guile/guile/guile-core/
  gzip            http://git.sv.gnu.org/cgit/gzip.git/
  hello           http://cvs.sv.gnu.org/viewcvs/hello/hello/
  hivex           http://git.annexia.org/?p=hivex.git
  icoutils        http://riva.ucam.org/svn/cjwatson/src/debian/icoutils/trunk/icoutils/
  inetutils       http://cvs.sv.gnu.org/viewcvs/inetutils/inetutils/
  jwhois          http://cvs.sv.gnu.org/viewvc/jwhois/jwhois/
  libdap          http://scm.opendap.org:8090/svn/trunk/libdap/
  libffcall       http://savannah.gnu.org/projects/libffcall/
  libgnupdf       http://cvs.savannah.gnu.org/viewvc/libgnupdf/?root=pdf
  libguestfs      http://libguestfs.org/
  libiconv        http://libiconv.cvs.sourceforge.net/libiconv/libiconv/
  libidn          http://git.sv.gnu.org/gitweb/?p=libidn.git
  libksba         http://cvs.gnupg.org/cgi-bin/viewcvs.cgi/trunk/?root=KSBA
  libntlm         http://git.josefsson.org/?p=libntlm.git;a=summary
  libprelude      https://trac.prelude-ids.org/browser/trunk/libprelude/
  libpreludedb    https://trac.prelude-ids.org/browser/trunk/libpreludedb/
  libtasn1        http://cvs.gnupg.org/cgi-bin/viewcvs.cgi/libtasn1/?root=GNU+TLS+Library
                  http://repo.or.cz/w/libtasn1.git
  libvirt         http://libvirt.org/
                  http://git.et.redhat.com/?p=libvirt.git;a=summary
  m4              http://git.sv.gnu.org/gitweb/?p=m4.git;a=summary
  mailfromd       http://svn.gnu.org.ua/viewvc/mailfromd/trunk/
  mailutils       http://cvs.sv.gnu.org/viewcvs/mailutils/mailutils/
  man-db          http://www.chiark.greenend.org.uk/~cjwatson/bzr/man-db/trunk/
  miktex          https://svn.sourceforge.net/svnroot/miktex/miktex/trunk
  msmtp           http://msmtp.cvs.sourceforge.net/msmtp/msmtp/
  myserver        http://git.sv.gnu.org/gitweb/?p=myserver.git;a=summary
  netcf           http://fedorahosted.org/netcf/
  newts           http://svn.arete.cc/newts/trunk/
  parted          http://git.debian.org/?p=parted/parted.git;a=summary
  patch           http://git.sv.gnu.org/gitweb/?p=patch.git
  prelude-lml     https://trac.prelude-ids.org/browser/trunk/prelude-lml/
  prelude-manager https://trac.prelude-ids.org/browser/trunk/prelude-manager/
  pspp            http://git.sv.gnu.org/gitweb/?p=pspp.git
  radius          http://cvs.sv.gnu.org/viewcvs/radius/radius/
  sed             http://cvs.savannah.gnu.org/viewcvs/sed/?root=sed
  shishi          http://git.sv.gnu.org/gitweb/?p=shishi.git
  tar             http://cvs.sv.gnu.org/viewcvs/tar/tar/
  texinfo         http://cvs.sv.gnu.org/viewcvs/texinfo/texinfo/
  vc-dwim         http://git.sv.gnu.org/gitweb/?p=vc-dwim.git
  wget            http://hg.addictivecode.org/wget/mainline/
  wydawca         http://svn.gnu.org.ua/viewvc/wydawca/trunk/
  wyslij-po       http://svn.gnu.org.ua/viewvc/wyslij-po/trunk/
  zile            http://www.gnu.org/software/zile/

The following packages are using gnulib without gnulib-tool:

  libtool         http://cvs.sv.gnu.org/viewcvs/libtool/libtool/
  libgcrypt       http://cvs.gnupg.org/cgi-bin/viewcvs.cgi/trunk/?root=Libgcrypt

Articles:

  "Using Gnulib to improve software portability",
  by Diego 'Flameeyes' Pettenò on December 28, 2005,
  http://www.linux.com/articles/50702

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