Do Social Networking for your website. Create pages in Social Networking sites like Facebook, Stumbleupon, My Space, Linkedin etc, and add friends who is interested in your products or services also update those pages on regular basis. G,Luck
Make sure you have good quality content that people would want to read. Make sure its unique and not just fluff like the millions of sites on the net. Good content is the key to attracting and retaining visitors. You should also submit to socialbookmarking sites to increase your exposure. Yahoo answers can also be used wisely to improve visitors. Besides this, you can also try some PPC advertising.
If you really want to improve your visitors DRAMATICALLY I would recommend that you purchase cheap website traffic .... or if you want to go on the high roller end you can just go with google adwords (PPC). I would recommend getting the traffic from trafficuni.com though