--Encourage your visitors to subscribe your RSS feed. Keep the "subscribe" button or the feed icon in a visible place. --You can develop custom gadget related to your industry/niche based on your feed which user may install in their site/blog. -- Use services like Feedburner.com, that will help to manage your feeds and subscription easily also you will be able to track the result.
submitt your rss feed to rss feed directories.that will get you some traffic.there are many rss feed directories
Make it easy for people to subscribe, and when you start using sites like squidoo and hubpages you can add the RSS from your blog there.