Google Website Optimizer
compuglot writes "Google has released the third leg of the stool in its quest to dominate online marketing. Google Website Optimizer is a multivariate testing application that allows users to test elements and combinations of elements in a website or landing page. The goal is increased conversions, and of course AdWords market share."
For certain values of "better". You wouldn't believe the stuff I've had to reject from such departments: confusing Columbia with Colombia, introducing spelling errors into the copy, confusing plural and possessive forms, using twelve different typefaces in a 1.8x4 inch space, messing with the company logo, you name it. Such a department has to be kept on a short leash. Always get a proof before the ad runs and make sure there's plenty of time to correct things before the ad runs.
Remember RFC 873!