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he AdSense Optimization team at Google recently conducted a live chat where they shared some useful tips on improving revenue from text ads as well as AdSense for search. The presentation was followed by an interactive Q&A session with AdSense publishers.
Recording of AdSense Optimization Webinar
In case you missed this webinar, here’s a complete recording of the presentation that was sent to all registrants via email. The Q&A starts at 26:00.
 
And here are answers to some of the most frequently asked questions from the AdSense chat session again shared via email.
Q: What is the performance difference between the 300×250 and the 336×280 units?
AdSense Specialist: The 336×280 usually has a higher CTR; however we tend to have a higher image inventory for the 300×250 unit. Ultimately, both the large and medium rectangles are two of our top performing ad units, so using the one which fits most seamlessly into your site design is key.
Q: Does adding additional AdSense ad units to your pages decrease CPC or eCPM?
AdSense Specialist: Usually, most publishers see overall revenue gains if they place more ad units on their pages. Publishers may see a decrease in the average "eCPM" in their account, but this is expected because the additional ads on a page will usually generate lower per-click revenue. For example, the top 4 ads on a page will generate the most revenue through our auction model, and the next 5-8 ads will generate lower amounts. However, the overall revenue generated will usually be higher for the publisher.

Google AdSense publishers can place up to:
a. A Maximum of three AdSense for content units (text, image or rich media) on one webpage.
b. A maximum of three AdSense link units (horizontal or vertical)
c. A maximum of two Google Search Boxes on one web page (it can be Google custom search as well but make sure the Google logo is visible).
d. One Video AdSense unit (this has been discontinued)
Google AdSense program does not permit AdSense ad code to be placed in email messages or newsletters. Nor are you allowed to add AdSense ads in software application, browser tools, extensions, etc.
The Google AdSense code may be implemented only on web-based pages.

Quickly wanted to share that Digital Inspiration was recently featured on the AdSense Chinese blog – the English translated versions are available here and here.
In related news, the arrangement of Google ads on this site was recently discussed in an online webinar on AdSense Optimization at 11m 20s (placement targeting) and again at 13m 18s (Ad Link units). Thanks.

Google India is holding an event tomorrow in their Gurgaon Office for AdSense publishers.
The email invite says "Google India Publisher Day" and though I am not quite sure about the exact agenda for this event, it would be a nice opportunity to meet members of the Google AdSense team as well as fellow bloggers who are AdSense publishers.
Do you have anything to ask?
If you have any questions related to the AdSense product that you would like to ask the official team members, please put them in the comments and I’ll pass them on.
If you are also attending this event, please wave.

Map of Google Gurgaon

Above the Fold refers to any area on the web page that is prominently displayed and this generally is the upper half section that the visitors can read without touching the scroll bars of the browser.
It’s a common understanding that Google AdSense Ads perform best when placed above the fold as they get maximum attention and hence a higher CTR.

There’s however a different opinion now which says that Ads may get more clicks when placed next to the content or near the comments:
"A couple years ago there was this idea that putting the ad above the fold would get more attention. However visitors just completely overlooked the ads because they were coming to the site to read the content and didn’t give a doodle about what sat on the way top of the page. And really, when people were reading the content, the ads were too high to see and/or click on and website owners and their advertisers were not making any mula.
Today we put the ads next to the content or in between action points like commenting or sharing links. This is because the visitor subconsciously sees the ad and may be looking for something to do next. When next to an action point like a comment, the visitor is no longer reading the article and is much more inclined to click on an ad. " Link.