By default, Joomla only syndicates RSS for items assigned to the frontpage. If you want to syndicate a RSS feed for a page or section other than the frontpage, you have to use a replacement component. This is what I've been testing today (2006 Dec. 3).

At this moment, I'm using this combination of component/module to syndicate my Blog:

RD RSS (component)
RSS Feed XTD (module)

This combination is going the direction I want, I believe, because these modules together make it possible to create a number of feeds out of any content section or category. This way, one site can host multiple RSS feeds.

I'm still tinkering ;-)