The web site for Quantum-ESPRESSO is: http://www.quantum-espresso.org/. Releases and patches of Quantum-ESPRESSO can be downloaded from this site or following the links contained in it (see also the PWscf web: http://www.pwscf.org/).
Announcements about new versions of Quantum-ESPRESSO are available via a low-traffic mailing list Pw_users: (pw_users@pwscf.org). You can subscribe (but not post) to this list from the PWscf web site.
The recommended place where to ask questions about installation and
usage of Quantum-ESPRESSO, and to report bugs, is the Pw_forum mailing
list (pw_forum@pwscf.org). Here you can obtain help from the developers
and many knowledgeable users. You can browse and search its archive from
the PWscf web site, but you have to subscribe in order to post to the list.
Please search the archives before posting: your question may have already
been answered.
Important notice: only messages that appear to come from the
registered user's e-mail address, in its exact form, will be
accepted. Messages "waiting for moderator approval" are automatically
deleted with no further processing (sorry, too much spam). In case of
trouble, carefully check that your return e-mail is the correct one
(i.e. the one you used to subscribe).
If you specifically need to contact the developers of Quantum-ESPRESSO (and only them), write to developers. You find them at pwscf-dot-org (notice: the not-so-difficult riddle is needed to protect such e-mail from spammers).
Other pointers:
DEMOCRITOS: http://www.democritos.it/
INFM: http://www.infm.it/
CINECA: http://www.cineca.it/
SISSA: http://www.sissa.it/