Main target sizes to focus upon are 728x90 and 468x60, however final design should include ads for all google banner sizes:
300 x 50 -Mobile leaderboard (7.5K max non animated)
468 x 60 -Banner
728 x 90 -Leaderboard (with and without animation)
250 x 250 -Square
200 x 200 -Small square
336 x 280 -Large rectangle (with and without animation)
300 x 250 -Inline rectangle
120 x 600 -Skyscraper
160 x 600 -Wide skyscraper
File-size of individual ad should be less than 40K, 20-30K recommended.
The landing page for the add is:
The ad should resemble the joomlapolis website in terms of color and over-all look and feel .
The add should be built to maximize click-thru.
Designers are free to propose creative graphics and texts.
The adds should look appealing to professional web designers.