I would say that Safari from off version 2.0 has an RSS preference tab (I just checked it and it is on 2.0.4).
Open it's preferences and the RSS preference tab should be noticable (5th tab).
As for bookmarking RSS feeds, it works the same as bookmarking any page.
So i made a seperate Bookmarks Bar Tab for all my RSS feeds.
You can recognise a RSS Feed by the RSS logo that will appear on the right side of the Safari URL field.
