Has anyone did the following already?

Some sites are serving site wide rss/xml feeds. In Firefox you can see if a site has it available when there's a RSS icon in the address bar.
(I.E. slashdot has one.)

This is achieved by code at the html header like below;
<link rel="alternate" title="Slashdot RSS" href="http://rss.slashdot.org/Slashdot/slashdot" type="application/rss+xml">

Now i would like to have such a feed too with the latest Journal content items for example. Does anyone has done this before or knows how to do this already?

This post helps a bit so far...

http://www.liferay.com/web/guest/community/forums/message_boards/message/99346