Assigning to Eloy in the hope that you can help with this issue as follows:

1. Add an FAQ index link to the moodle.org footer so that it reads:

All content on this web site is made available under the GNU General Public License, unless otherwise stated. Please see our FAQ index and read our Policy on advertising.

where "FAQ index" is a link to http://docs.moodle.org/en/Category:FAQ

2. Add an FAQ index link at the bottom of all forum emails (as suggested by John Isner http://moodle.org/mod/forum/discuss.php?d=90165)

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FAQ index

where "FAQ index" is a link to http://docs.moodle.org/en/Category:FAQ

About the change in forums... Should I do it officially, in forum code with something like this:

0) Make 'faqindex' one new string in lang files, to be able to i18n it.

1) Create one new $CFG->forumextralink (config.php only) option with format:
$CFG->forumextralink = 'langstring:url';
or, more exactly, in our case:
$CFG->forumextralink = 'faqindex@http://docs.moodle.org/en/Category:FAQ';
So, one link to that url will be created with the desired langstring (faqindex).

3) Add it to the bottom of individual forum emails as suggested.

Or perhaps should I, simply, hack it in moodle.org? No good for upgrades and so on.

Ciao

Thanks for adding an FAQ index link to the moodle.org footer

Thanks also for the reminder that we should consider lang issues.

Re. the moodle.org footer text, I assume this will be added to the moodle.org lang file (MDLSITE-297) when we implement the moodle.org site improvements (MDLSITE-132).

Re. the forum email link, I assume this will only be required on moodle.org. I can't imagine other Moodle sites wanting an additional forum email link. On moodle.org, the FAQ index link will be most relevant for Using Moodle forum emails, though courses in other langs should also be able to have the link if they wish.

Thus, my suggestion would be to add an faqindex lang string to the moodle.org lang file. Is it possible to give discussion courses in other langs the choice of whether an FAQ index link is added to their forum emails or not?

You're right about the Google search of moodle.org being really useful, so I've added a link to it on http://docs.moodle.org/en/Category:FAQ

Martin, thanks for reporting this issue, and Eloy, thanks again for helping fix it

Resolving the issue for now. Please re-open if it seems that FAQ pages need further promoting in future.