...Digg. I have sworn by Digg for traffic to my blogs. If you Digg every post, you can expect it to account for at least half of your traffic, until you get indexed. And what is the system to get your blog indexed the fastest? Digg. Not to mention that after you get indexed, digg will continue to bring in large amounts of traffic. This, mixed with Stumble, Delicious, and Technorati is a one, two, three, four punch for SEO and traffic.