Listing your RSS feeds in directories is a good way to get some extra traffic and back links. If you don't know where to submit your feed head over to my humongous list of feed directories.
If you are a bit devious you can gain a lot from all those bloggers scraping feeds for their auto blogs. Make sure you link back to your own site within every post.
Using a WP plugin like Go Codes you don't have to link back to your own articles, even your affiliate links will be back to your own site.
For some extra exposure, that I guess is border line black hat, run your feed through feedburner and submit that to all directories. Then you can create a yahoo pipe for your feed and submit the rss result of the pipe to the feed directories.
If you're a WordPress user I've got a wicked feed tip for you in my newsletter. So go sign up in my sidebar.