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A DigitalPoint Forums thread has an image of an AdSense ad that has the titles styled in italics fonts. Here is a screen capture from the forums, you can click on it for a large image:
As you can see, this is not the standard:
Several DigitalPoint Forum member said they have recently seen these ad styles around the web. So it appears that this may be a limited Google test and not a premium AdSense publisher modification.
Forum discussion at DigitalPoint Forums.
