Trying to get your marketing bang on can be an ongoing and exhaustive process. Fortunately, the Marketing Experiments Blog has written about 10 resources to help your online testing efforts. They include article styled resources for ad copywriting, call to action, lead generation, landing page optimization, conversion, value proposition optimization and more.
With online marketing, continually evaluating data and tweaking all aspects of your site mechanics is the only way to improve conversions, and hopefully your bottom line too.