The watchlist feature let users subscribe to specific pages or even entire spaces and receive mail &/or RSS notifications when one of the pages is modified (or created in a watched space). Users can choose the email notification rate (receive new mails every hour, every day, every week or every month). The RSS feed all modified watched documents ordered by dates desc.
Original idea :
it should be very useful to be notified by mail of document changes.
the notification should be filtered by space if needed.
this feature is already implemented with rss which permits to know last changes; but if you don't grab periodically the rss feed, you lost some changes...
this feature will be very useful , especially for translators:
for example, the jGuard project provides some translations of its documentation, but translation synchronization is very hard to do.
with this feature, it will simplifies the work (translators will be more reactive to synch their translation).