Best Adsense Format
If you are looking for Best adsense format (i.e. the one which brings highest revenue) then it is 336×280. It has been reported repeatedly as well as acknowledged by most of the webmasters that the big ad unit brings maximum clicks and revenue as it is very much on the face.
Infact here are the Top 3 best Adsense Formats in terms of revenue -
1. 336 x 280 Large Rectangle (300×250 can also be put in the same category) - The ads of large rectangle takes lot of space and are probably the most visible among all ad formats. They are used at the top or bottom of most of the pages and because people read in F format, they get maximum exposure.

2. 728 x 90 LeaderBoard - Leaderboard were heavily used in the past and were the most popular adsense ad unit but nowdays with more sleak designs, they have been replaced with 46×060 ads. Normally leaderboards are used at the top for maximum exposure.
3. 160 x 600 Sky scrapper is the third most popular and high paying adsense format. it is used in the sidebars, mostly on right. Its great for the sites which have lot of sidebar space as you can always put these ads without compromising much on user experience or on content. You can see the image here
Most of the adsense ads format are anyway variants of these three, personally I prefers 468×60 as seen on this blog as they are less intrusive and fit well in content.
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1Make Money Online on Apr 6, 2009 :
For me, large rectangle works best though I don’t think you can say that a particular ad format is better then other or performs better then others.
I think ad placement, blending and most importantly relevancy are the factors which decide the ROI and earnings for your adsense ads.
2johan Crase on May 8, 2009 :
I like the adsense format you are using, is this 336×280 ? I don’t think adsense skyscrapper looks that good, personally i will stick with big ad blocks
3Abhimanyu on May 8, 2009 :
yes I am using 336×280 without borders. I like to use ads without borders, please check my adsense optimization tips http://mwolk.com/blog/adsense-optimization-tips/ to know more.
4Mohammed Rhalmi on Jan 31, 2010 :
I use 336×280 under each post. It works. What I am looking for is the best format for the right sidebar. I am using a large skyskraper buat it looks ugly there!!