Google quietly added Conversion Optimizer to every advertiser's AdWords account a few months ago. In a nutshell, it regulates keyword-level bids, promising to deliver as many conversions as possible, at or below a cost-per-conversion you specify. In today's paid search column, "Google Conversion Optimizer: The Best-Kept Secret in PPC?," David Szetela describes the benefits of using an automated bid management, available for free and using Google's proprietary data.
