Commenting on blog posts written by industry experts with lots of followers can bring your website a lot of traffic. When you post a comment (most) blogs allow you to leave a link back to your site for other readers to check out – as long as you leave an insightful comment you WILL get traffic from your blog comments. Make sure you comment as quickly as possible when new blog posts go up. The higher in the comments you are the more clicks you’ll get. I have Google Reader setup to alert me when new blog posts are made on the industry blogs I follow and I comment immediately to lock in my first place spot.