Suki,
If you are talking about people scraping your blog posts, you should add the plugin below. It will add a link to your blog (and the particular blog post they use) from your rss feed. That away you are getting backlinks from the people using your posts. It also shows that your content was the original.
Heres the link:
Make the scrapers work for you! - Joost de Valk's SEO Blog