6
Well, the script seems happy pulling feeds from news and articles modules, e.g.
/backend.php (News 1.44)
/modules/wfsection/backend.php (WF-Section 2.07b3)
/modules/smartsection/backend.php (SmartSection)
and... after some messing about, with my forum CBB 1.16a
/modules/newbb/rss.php?f=1
where f=n is the forum number. You MUST however allow anonymous users to view this forum, otherwise it will not work and you'll get a 'feed not found' error message.
EDIT : I've discovered you can also use:
/modules/newbb/rss.php?c=0
to pull a feed of all the forum categories, or use a number to target a specific category.
A thread is for life. Not just for Christmas.