HD Themes
Theme images are no longer blocked off by sidebars and other navigation panels. Images now extend across the whole screen, and Google is adding a new set of HD theme images from iStockphoto.
More Ads
Google doesn't mention this in its blog post, but the for Gmail's new look shows ads in a couple new places. While viewing the main inbox, a text-based ad appears on top, and when viewing individual e-mails, the ad moves down below. The look a bit like the optional "" that users can add to Gmail, but these are different, because you can't scroll through them for editorial content.
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