Custom formats for Text Ads?

I recently saw an interesting format for text-ads on the site http://www.labnol.org/internet/blogging/increase-feedburner-subscriber-count/4121/ - top and bottom of the post there are 2-line text ads from adsense in a different format.

If you study the source-code you can see

<script type="text/javascript">google_ad_client="pub-3152670624293746";google_ad_slot = "7692924113";google_ad_width = 728;google_ad_height = 15;</script>
<script type="text/javascript" src="http://pagead2.googlesyndication.com/pagead/show_ads.js"></script>

1. Do you know this kind of ad-formating (with google_ad_width and google_ad_height)?
2. It is pretty unique, is this allowed by Google?

 

thats a premium publisher account
yes, its allowed by google but only for premium publishers.

 

Google is kinda' strict in terms of publishers

 

its for the premium publishers only.u need lot of traffic requirements to apply into that.

 

Yes..
Premium publishers get more than 2 millions impressions per month and so google allows them to customize the adsense code.