Responsive web design
About the new ad sizeThe 300 x 600 ad unit, also knows as a half-page unit, goes into the 'large' category, and offers a larger space to advertisers to advertise their content, and offer users rich engagement. And so far, it seems to be pretty popular, and is one of the fastest growing ad unit sizes by way of impressions. So for publishers, it could be a better trade-off between ad space and ad revenue. It also shows advertisers prefer the larger ad size, since it better promotes their product(s).
Since this ad unit is so recent, it currently only shows text ads. It'll take some time before a range of display inventory are added. So instead of worrying about the content that is being displayed, focus instead on where to place the ad, because it could play a part in your impressions. Read the following post to get a better idea.
AdSense Plus Page. Happy monetizing :)
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