1. Free Classifieds - This system works more effectively, especially if you have 'Make Money Online' related websites.
There are some popular Free Classifieds Websites around there to post your ads for free, just make a search 'Free Classifieds' 'Post Ads' etc in Google and you can find some good classifieds sites list. The title of your ad must be attention grabbing to make it stand out from the rest. The description should be short
but informative. Don't forget to add your website url in the ad form.

2. Link Exchange - Make relevant link exchange with other sites and preferably on homepage. If not, try to add your link on their directory. It will help to get traffic both from their sites visitors and also it boosts Search Engines Rankings. Don't try exchange with Link Farms, also don't exchange links with more than 100 links in that page.

3. Blog Traffic - Create a Blog in Blogspot.com and make some posts with good content and make a link on your main website, it helps start getting traffic from Search Engines quickly, especially from Google. Update your blog regularly, so that the Search Engines spiders crawl your blog at regular intervals. Ping your blog whenever you update. Generate RSS feeds to your blog, so that visitors can read in a RSS reader right on their desktop.

4. Opt-in Email Lists - Its very important on getting repeated visitors to your website and this can be done by capturing visitors email address. You can send emails whenever you update the website. Use autoresponders like aweber or freeautobot for follow-up emails. Don't bombard with emails daily with offers. It is a surefire way to make your visitors click the unsubscribe link. Give an interval of minimum 2-3 days for each mail.

5. Forum Traffic - Its another important factor getting free traffic from discussion forums, make a search 'keyword+forum' on Google to find your website related forums and add your url in the signature. Make some useful conversations with others and don't try to promote your products or offers directly in the posts. It also helps on SEO aspects.

6. Writing Articles - If you have enough time and having writing skills, write articles on topics that interests you and submit to article sites. Content will always be the king and most of the websites look for content to add on regular basis. If your articles are informative enough, they are more likely to get published on other websites. Don't forget to add your website link in resource box of the article.

7. Ebook Traffic - Compile some useful information about your niche and make it an ebook and give it away for free to others. Add your website link in the ebook and allow the permissions to give it away for free to others. You can also entice your visitors to sign up for your list by offering the ebook in return.