[Edit: Disabled due to forum crash]
[Edit2: we can now use the new phpBB's inbuilt ATOM support - try feed.php]
RSS feed support has been added to the forums.
rss.php - provides a feed of the latest posts.
rss.php?t=1&f=19 - shows the latest topic titles from the Announcements forum. This can be used to receive announcements of a new version automatically.