Promotion, Promotion, Promotion...It never ends!
Here's one source that has many programs to help you increase your overall traffic. Use the ones that better suit your needs: Ad2Go.com
Plan on spending some time on this site because there are lots of ideas. I use a good chuck of what's there to promote my sites. How many sites do I have now? I am running over 40 sites so you can imagine I need a lot promotion to keep them going strong.