Hi Every one who want to earn money by using google adsense ! Let i will send a guide to you the things which i have leaned from the various sites like :

What is google adsense ?
How it works ?
Is google really paying?
How to starts your own adsense program?
What are resouces you reqire?
Is there any programming need?
How much you need to invest to start your own addsense website.
Can you place one site contents to another site?
and lots of questions you have in your mind.

10 Powerful Secrets You Must Know In Order To Make Money With AdSense In 2008-2009
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Tip #7: The Fewer Ads the Better
When Google raised the ad block limit from one per page, to two, and then later to three, many marketers decided it would be a good idea to go ahead and max out the number of ad blocks on their pages.
That was not a good idea and many of these marketers have suffered from it.
It is important for you to remember that when you publish Google AdSense ads on your pages, Google is effectively syndicating their Adwords ads, which is a pay-per-click advertising network.
What that means is the ads at the top of the page are there because the advertisers for those ads are paying more (for the better placement) than the advertisers with ads at the bottom of the page.
What this means to you is if you max out the number of ad blocks on your page, you will go from having 4 ads to having 12 ads. This is assuming that you are using the large rectangle ad block. The math: 4 ads per ad block and 3 blocks equals 12 total ads.
At first glance you might consider this to be a good change, one that should be more profitable for you, right? After all, the more ads you have available the more chances you have of getting a click. Seems to make sense, doesn’t it?
Actually, it is not a good thing for you because it can very easily and very quickly cut into your profits.
Why?
My tests in this matter have shown us that not only do we get fewer clicks the more ads we have on a page, but we also earn much less for every click that we do get.
we decided that this only makes sense.
If the top ad on your page pays you $0.50 per click, there is a very good chance that the bottom 4 all pay less than $0.15. In essence, by increasing the number of ads, you are trading higher-priced (higher paying) clicks for lower-priced (lower paying) clicks.
We tested several pages of my own and decided that 4 ads is usually the golden goose. However, this is not a hard and fast rule that must be observed at all times. Occasionally, a 2 ad block pulls the best combination of earning-per-click (EPC) and click-through-rate (CPC) which is exactly what you want.
My advice is if you're using more than one ad block on your page, test that same page with just a single block and careful keep track of the results. Odds are you will make more money by decreasing the ads.