http://www.cssnewbie.com/4-ways-css-can-improve-your-seo/
Good SEO suggestions from web design perspectives, the key point is about HTML formation, page layout, and web eyeball study.
In the world of SEO, size and location matter. If your page is significantly long, the content towards the bottom of your page won’t rank as “important” as the stuff at the top.
Page layout would be important both to content emphasizing and Adsense banner placement, apart from the tips given above, the Google Adsense Australia Team has given similar suggestions on how to place the banner add in the most strategic position to maximize the click through rate.
Optimizing your AdSense performance
References:
Webpage and Web Site Design and SEO :: webeddy.com
SEO Web Design, Website Optimization, Search Engine Marketing
