We just released a new WordPress plugin, Replace by Referrer , which allows you to track the effectiveness of SEO and other online marketing activities by replacing text on your landing page based on the referrer (i.e. which search engine or site referred the visitor). So, for example, you might want to offer a different toll-free phone number depending on the search engine used by the visitor. That would give you the ability to track the number of phone inquiries delivered by each search engine. Pretty cool, eh!
It’s free and open source. Download it now  for your WordPress blog or site. Enjoy!