What I can tell you from my own experience is this:

1. Ads at the top of the page and on the left of the page perfom better than any other ads. (Take a look at the "heatmap" from the Google link below)

2. Ads without background colour and borders perfom better than ads within borders with background colour.

3. Ads within content pages perform better than any other ads.

4. A search box on every page gives you another chance for earning Adsense income.

5. A blue link at the top of the ad, the ad in black, and the url also in black so that it blends in with the ad copy - also tends to perform well. A black url makes the link stand out and gives you a better chance of someone clicking on it.

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Google does not disclose exactly how much you'll earn per ad that is clicked.

The commission you receive per click depends on how much advertisers are paying Google for the particular ad. You will earn a share of that amount. I've heard of earnings anywhere from 2 cents to $15 per click.

So it is logical to believe that keyword phrases like debt free, employment, make money, mp3, sex, etc. will earn you more per click since these are highly competitive keywords that are searched for quite a bit on the web.

Advertisers generally pay more for popular terms because they are searched for more.

Even though Google will not reveal how much you are earning for each ad that is clicked from your site, you can still login to your account at any time and see the total amount of revenue you've generated that day, week, month, year, etc.

For example, if you see that you've made $12.60 today from 9 clicks then you can calculate that your average click-thru commission was $1.40 per click. That's as detailed as their stats will get. Also remember, that's only an average. You won't know how much each specific ad brought in.

The amount you'll earn also depends largely on the amount of targeted traffic you receive to your own site, how well the ads match your audience's interests, the placement of the ads on your pages, and of course the amount you receive per click.

Ideally, you should create a site on a topic you know a lot about. That way you'll have a much easier time creating a generous amount of content on that subject.