The Google Website Optimizer Plugin integrates the Google Website Optimizer into WordPress blog posts and pages. It allows WordPress bloggers to insert the tracking codes required to run headline and copy tests to determine which blog copy/content drives the best conversions.
This plugin has been essential in testing our WordPress landing pages. You can enter the details of a Google Website Optimizer campaign at the page or post level to create your A/B or multivariate tests.
All in all – a must have for anyone wanting to run split tests with WordPress.