Search Marketing has redefined the art of copywriting with the limited and precious space allowed by Yahoo Search Marketing & Google.

Now, with the Google Quality Score and the Yahoo Quality Index, the copy on the landing page can be just as important to optimize a site’s conversions, which then effect the ranking of its sponosred search ads.

Here’s a glimpse into the copy and usability testing Google Gmail has been running on their home page, to persuade new users to sign up (Thanks Manoj Jasra).

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