What is the best Google Adsense format?

468 x 60 on most of my blogs. I am in the midst of getting rid of all those large rectangles.

If you want to put banner type ads on your site you should pick the 468 x 60 banner with 2 ads in it. This type of banner can be used very effectively on top of content or below it. The half banner only shows 1 ad and can be used everywhere on your site. Its size is 234 x 60 pixels. However if you want to go for a more vertical layout of your ads the 120 x 240 pixels vertical banner may be the one you are looking for.

Based on survey, poll result popularity of adsense format are:
1. Large rectangle
2. Banner
3. Skyscraper
4. Leaderboard
5. Medium rectangle

Making your ads more clickable is another way to increase your earnings. It is relatively easy to do because you can adjust your ad format almost immediately. You can do the following adjustments to your ad format to improve your click through rate (CTR):

* Make them more noticeable by positioning your AdSense ads on top of your AdSense page.
* Google states that the most effective ad formats are 336×280 larger rectangle, the 300×250 inline rectangle, and the 160×600 wide skyscraper. However you should choose the best ad format that works for your web site. This requires tracking and testing.
* Create a custom palette that best suites your web site. In general, you can follow the following settings:
o Border color : no border or background color of your website
o Background color : background color of your website
o Link color : color of your links
o URL color : black
o Text color : black or color of your main content

Please your skill creatively to get best CTR.