I have been watching the interaction of Jef Poskanzer of acme.com with AdSense with great interest over the last couple of days, because the way that Google AdSense deals with its publishers interests me a great deal both personally and professionally. On January 30, 2012, Jef posted this article on his site, detailing how AdSense suddenly deactivated his account and denied his appeals to be reinstated. That’s not necessarily the disturbing part, although it brings up the all-too-real fear that I believe all of us web publishers have that one day Google will frown on us and make the same decision on our accounts. However, I read today that his account was quickly reinstated when Matt Cutts got involved on Google+.
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Exploring Standard Ad Unit Sizes: Google AdSense 160×600 Wide Skyscraper

The wide skyscraper is another ad unit that has taken over as one of the most prevalent ad units visible throughout The Internet. This ad size is recommended by all of the major ad networks, including Google AdSense, Microsoft Advertising and the IAB (Interactive Advertising Bureau). Unlike most of the square ad units, the skyscraper is designed for very specific locations, as it is very tall and thin, although not as thin as its predecessor, the 120 x 600 – Skyscraper. The skyscraper is very useful for small columns, or rails, on your site, under menus, categories, tags or other, similar list-type content.
Because of this, the 160 x 600 – Wide Skyscraper has become harder to find, as wider screen have allowed the navigation columns to expand to 250 or 300 pixels, accommodating the larger square ad units. However, a lot of properties are starting to put the Wide skyscraper next to a list or menu in the wider columns that are now found in most modern layouts.
Exploring Standard Ad Unit Sizes: Google AdSense 336 x 280 – Large Rectangle

Google’s second recommended ad unit size for AdSense is the 336 x 280 – Large Rectangle. This ad unit size is not listed in the most popular sizes on the Yahoo! Ad Network, but is on the listed in the Microsoft Advertising PubCenter for ad publishers for small businesses, but not in the Standard Ad Creative Acceptance Policy for Marketers & Agencies. On the IAB (Interactive Advertising Bureau) Ad Unit Guidelines, this size is listed in the Delisted Standard Ad Units as of February 28, 2011.
While this size is available in AdSense for both text and image/rich media ads, it seems that this size is used mainly for small publishers and due to it’s size, is commonly used to take up a large area of the content. Google offer examples of the 336×380 Large Rectangle and they are all embedded in or below the content.