Viral Traffic is the easiest way to get some residual and guaranteed traffic. There are a ton of traffic exchanges from Auto to Manual that many people use but with those, however, you have to CONTINUE to return to them to receive traffic by surfing their site. With Viral Traffic Exchanges your referrals are forced [...]

Image by Kinologik via Flickr

Getting your sitemap.xml file setup properly is another way to get a good listing in search engines like Google. It does not work against, but WITH your robot.txt. Although you CAN have one WITHOUT the other.  Check my past post on setting up the robot.txt.
What are Sitemaps?
(from Wiki) “The Sitemaps protocol [...]