Yield Software, a service that promises to automate the process of search engine optimization (SEO) and search engine marketing (SEM), has recently raised $6 million in its second round of financing. The San Mateo, California, company claims to be the simplest and most affordable option on the market, and targets small and mid-sized websites that don't have the money or time to devote to optimizing for organic and paid search. The technology automatically makes changes in search campaigns, experiments with new landing pages, and adjusts when search engines change their algorithms, constantly testing for combinations that generate the most traffic. There is a whole industry of professionals dedicated to doing exactly this, and Yield Software may or may not pose a significant threat to all but the best. Yield Software competes most directly with HubSpot and Coremetrics. Despite its well-funded competition (Recently, HubSpot raised $12 million and Coremetrics $60 million ), Yield managed to attract investment from the respected VC firm Draper Fisher Jurvetson, the advertising company WPP Inc, and WashingtonVC.