UPDATED:
Yourself. Make sure that your content is unique and updated. That’s the best tool that you can utilize. I know you’re looking for some type of "catch all" tool or technology that will get visitors. However, this part of blogging takes strategy, lots of effort and time.

Other than focusing on your blogging goals and identity, I recommend that you pick a few strategies from these long list and master them: http://www.problogger.net/archives/2006/02/28/19-strategies-for-finding-readers/ and http://www.problogger.net/how-to-find-readers-for-your-blog/ . Major ways to get visitors is through guest posting, networking, advertising, social media, and viral content according to Darren Rowse. Also, see these sites — Daily Blog Tips: http://www.dailyblogtips.com/ and
Blogging Tips: http://www.bloggingtips.com/ .

Daily Blog Tips has a series on web traffic, that spans 18 posts so far: http://www.dailyblogtips.com/website-traffic-series-part-1-web-design-and-css-galleries/ .