Here are some things you can do to guarantee some traffic.
Make sure to thumb up your home page, forum page, blog, etc. Also, whenever you make a new post or article thumb that up as well. I've seen traffic roll in pretty fast at times.
One thing I should warn you about though, sometimes doing too much of this can actually create far too much traffic. Someone I know did it with their forum and it shut the site down for a day or so.
Edited by martin_J, 25 March 2011 - 11:28 AM.