I've used FeedAPI in a similar scenario except I'm the one who adds the feeds cause I'm not sure some of the people know what RSS is even though they run a blog. I then set the "Author" of the "Feed" content type that handles the feed as the user and all the entries that get pulled in are credited to them as blog entries. This seems to work well and can be integrated with views, etc.
These two modules read in feeds from the outside and display the content on your site. Is this what you are looking to do? If you want something really basic the simplefeed module is great at that and fast. If you want to import media or do anything crazy the feedapi module is great for that.
If you want to create RSS feeds for content already existing on your site use the Views module.
I'm starting on a site where one thing that is wanted is each user to be able to create their own RSS feed. Both Simplefeed and FeedAPI were discussed in the "Drupal Church Recipes" episode, and I'm curious to see 1) what experience people have with those two modules and 2) which one would work best for what I need to do. I'm guessing I would somehow tag each feed with the user ID and then use a view in the profile (probably a panel pane) that would display the given feed items for that user, but I'm curious to see if anybody has a better idea.
Thanks.