Google Adsense is the best pay per click context based advertising programs today. Infact it can be said that Google adsense has really boosted webblogs & web publishers . There are many tips & tricks which helps to increase revenue .
Mainly there are some basic rules which has to be kept in mind. Firstly the theme & the content is very important. Niche sites generate more revenue as it is easier to achieve decent search engine placement for them.As the best way to increase revenue is through increased traffic & so the visitors will only spend time in your site only when your content is really interesting to watch out for .

Secondly before deciding the content check out how much the advertisers are paying for the advertisements.You can try out some free keyword trackers tools like this one http://www.digitalpoint.com/tools/keywords/
Try to target keywords which are moderately priced as the market is quite competitive nowadays.
You can also use Overture bidding tool http://uv.bidtool.overture.com/d/search/tools/bidtool/
to find out how much actually the advertisers are ready to pay you .

Thirdly its best to put the adsense code in the website templete as it easy to change the sizes & designs . Always follow the Terms of Adsense service as many sites claim to teach how to manipulate google adsense, never try to follow them as over a time as your relevence increases in google you will run the risk of getting noticed by google following unethical means.

These are very basic rules , apart from all these there are some useful tips for placing your ads which can help in increasing revenue which I would post next..