eMarketer.com released a study that shows how SEO has grown 33% in 2005 to 45% in 2006 in the category of best performing online advertising tactic, whereas search ads have declined a from 52% in 2005 to 49% in 2006. As you can see, search ads are still rated the best performing online advertising strategy, followed by email ads (in-house lists) and then by SEO. The study also shows that 34% of the ad budget is going to search marketing, 25% is going towards SEO tactics and 22% towards contextual ads.