Google uses more than 100,000 servers to store its data. These servers build-the Google data centers. Depending on the time and the place from which you access Google, Google will redirect you to different data centers.
For example, you might be redirected to the IP address 64.233.161.105 or to 216.239.57.105 when you enter www.Google.com in your web browser. Both IP addresses reflect different data centers in which Google will search for your query (the IP addresses in this example were operational on 29 March 2005, they can change at any time).

There are very many different Google data centers and each data center has its own index. Normally, the contents of the different data centers is about the same.
Webmasters who observe several data centers have found out that there are currently three types of data centers. Depending on which data center group you use for your search query, you’ll get different results.
What does that mean?

It seems that Google uses different algorithms in these data centers and that Google uses some data centers to test algorithm changes. Using only a few data centers allows Google to test algorithm changes without affecting all search results.
The three different data center groups that have been observed by some webmasters probably reflect the test of different algorithms that affect the same ranking factor.

Data center group one (the biggest) uses the current algorithm, group two (a small group) tests algorithm change A, group three (another small group) tests algorithm change B. That way, Google can test the best way to improve its algorithm without affecting all search results.

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Following are some tips to boost  traffic to your blog:

1. Get permalinks working as they are the only source to reach the desired post in one click and to add the post in favorites.
2. Try to get blog domain name same as that of your site.Your own domain gives you more control and  makes it easier for people to find you.
3. Allow public comments to boost visitor traffic to your blog.
4. Add a column for your favorite blogs on your blog so as to increase resources for your own blog as well as these links may persuade those bloggers also to link back to you.

When working with the pay engines, it takes practice to achieve a level of success. So, start out slowly, and keep a tight rein on the budget. As you become better at choosing highly targeted keywords and crafting titles and descriptions, you?ll gradually be able to increase your budget.

Here are some tips to boost your chances of success with search engies:

1. It’s not always best to be #1. Many compulsive "clickers" automatically click on the #1 result when they have no real interest in buying your products or services.

2. Be sure to include your keyword phrase in the title and description you create at the pay engines. Take special care in creating a description for your site, since within the top three slots, the best description gets the most traffic, as a general rule.

3. The keywords must be relevant to the content of your pages.

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