There are several ways you can promote your site or a page in your site for free, that may drive some traffic or maybe lots (if you’re lucky and the quality of your content is high), some of them are:
- Submit a story on Digg and Slashdot
- Bookmark your page on Del.icio.us and Furl
- Ping Technorati whenever you post an article
Note that in community-based services like Digg and Slashdot, you’ll most likely get negative results if you try to abuse it. As long as you stay within limits you’ll be loved by the community.