Joomla 1.5 supports exporting your section or category listing page as a RSS Feed right out of the box. So if you have a menu item linking to your latest news category for example, you can export this as a RSS Feed for others to add to their RSS Readers. The benefit is of course those readers will read your news updates without having to visit your site.
Either you can add a new Syndicate module which will show a RSS icon and link for the pages that support exporting, or just add the following to the end of the section or category listing URL:
?format=feed&type=rss
So for example, with SEF enabled your latest news RSS Feed would be:-
http://www.yourdomain.com/news/?format=feed&type=rss
Note: without SEF enabled, and with all the other variables in the URL, you would need to use an & instead of the ?. i.e. &format=feed&type=rss