Well, i don't have money and i won't waste if i had to auto join some directories. So if you don't spend money on content also, what would you do? Write alot of content or join as many directories as you can?
The best free traffic sources... 1. Search for "Insert Your Keyword Articles" and and email he site asking if they accept content. Then email them your content with a link in it. 2. Submit articles to the article directories. If you do not want to pay for software or a service just use the bog ones like ezinearticles, articledashboard, goarticles, articlefeeder, amazines, and so on. They get great bot activity and spidering to your site and if the content is good others will pick it up. 3. Submit to free directories... no more then 40 a week 4. Find blogs to post to... weblogsinc.com is a great source I love to use. 5. Free press release with prweb (you can not use keyword anchor text but it still gets you some links) Just my opinion as what works effective for free. Then if the site starts making money, reinvest some of the profits into the paid avenues. Yahoo is awesome but if you can not make money with free traffic do not waste money on paying yahoo. If you are making money though, yahoo and pr web paid options are very powerful.