1-Don’t display other contextual ads ,such as clicksor and yahoo on the same page as Adsense.
Chitika is tolerated.

2-Don’t ask your visitors to click on the ads,it’s against Google TOS.

3-Don’t label your ads with anything else,other than “sponsored links” or “advertisements”.

4-Don’t put your ads on a domain parking websites, pop-ups, pop-unders, or in any email.
It seems that google does tolerate one pop up per session,but if you are not feeling it email them or just don’t do it.

5-No need of using skyscraper ads,visitors don’t like them and rarely click on the long boxes anyway.

6-Be precise in your descriptive title, site description, and keywords,adsense will be able to serve more relevant ads to your website.
More relevant ads=more clicks=more money.

7-Try to blend your ads as much as you can,with your website’s template.Don’t use borders,they aren’t easy on the eyes.
With google’s palette colors you can do almost anything.

8-Place your ads on the header,who’s going to click on ads that are located at the bottom of your webpage.
Visible ads = more potential click = you already know what goes here .

9-Something that website owners often forget is that good content is also related to your success or not with adsense.
Good content=more potential visitors =more potential clicks = more ……..(fill in the blank with your comments).

10-Be good with adsense and adsense will be good to you.When you have doubts on something,just write them before you do anything that could cost you a ban.