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Google released a new label the canonical tag to resolve duplicate page problem, the canonical tag can represent a different URL on the same page, said method description to see specific references below.

Quote from:
http://www.googlechinawebmaster.com/2009/02/url.html
http://googlechinablog.com/2009/02/url.html

Specify your URL paradigm
February 27, 2009 morning 11:17:00

Posted by: Joachim Kupke, Senior Software Engineer; Maile Ohye, development projects and technology leaders

Original: Specify your the canonical
Posted on: Thursday, February 12, 2009, 12:30 PM

You may duplicate content would be the URL different to worry, Google now supports a new feature that allows you to specify your favorite URL format. If your site he provided the content is identical or very similar to him in the to the visitor through a variety of different forms of the URL, then this feature, you can independently control the URL format of your site appear in search results. It also helps those factors that affect your page reputation more fixed point to the URL format of your favor.

The pages of a sale of Swedish fish, for example, assume that we are favored by the URL format and the corresponding content is such as the following:

http://www.example.com/product.php?item=swedish-fish
However, visitors and Google robots can actually be accessed through the URL form to this content. Although the core part of the URL with your preferred URL format is very similar, but different browser types based on the sorting parameters or classification to provide users with a slightly different web page.

http://www.example.com/product.php?item=swedish-fish&category=gummy-candy
Or, might they have exactly the same, but the URL does not look the same, such as the following URL with a tracking parameters or session ID:

http://www.example.com/product.php?item=swedish-fish&trackingid=1234&sessionid=5678

Now, you can use the following statement <link rel="canonical" href="http://www.example.com/product.php?item=swedish-fish"/>
Added to the other you do not tend to the URL in the search engine part of the code, you can specify the URL of your favorite format.

For example, you do not want two formats appear in the search results:
http://www.example.com/product.php?item=swedish-fish&category=gummy-candy
http://www.example.com/product.php?item=swedish-fish&trackingid=1234&sessionid=5678

As long as you join the above statement to the two pages Code section, then Google will know more than two URLs is recommended to point to the criteria you specify URL: http://www.example.com/product.php?item=swedish-fish the. Other attributes of the URL, such as PageRank and other factors, will automatically point to the standard URL.

This standard also other search engines crawl and index your site to accept and use.

The following form, we will be the FAQ provides answers to some questions you may:

Is mandatory or not, I would like to ask the rel = "the canonical" is a recommendation or a directive?
A suggestion. This is a very proud feature, you can use this prompt search engines to consider your preferences on the URL format.

Can I use a relative path to specify the URL specification., Such as the <link rel="canonical" href="product.php?item=swedish-fish"/>?
Can use a relative path here can be correctly identified, if you specified in the code of the link, then the relative path based on this base URL.

I can URL paradigm to use on other pages not exactly the same content?
We allow some of the nuances between these pages, such as classified in different categories under the same product page.

If the specified canonical format of the URL returns a 404, how to do it?
We will continue to visit and crawl your content, and application of the association function to find a URL paradigm, but we strongly recommend that you will be an accessible URL set URL paradigm.

If I specify the URL of paradigm and not being indexed what will happen?
Like all public content on the network, we will strive to identify and find the URL you specify paradigm, once we index it as soon as your rel = "the canonical" put consider.

The URL paradigm can be a redirect URL?
Yes, you can specify a redirected URL in URL paradigm, Google will continue to follow the redirect and try to grab it.

If I do not care to specify the the contradictory URL paradigm of how to do?
Do not worry, our algorithm is very smart and tolerant, we will track to grab the URL paradigm chain, but we strongly recommend you as soon as possible to the specified URL paradigm for a specific single URL form to ensure your search results as soon as possible has been optimized.

The link tag can be used to suggest a URL on another domain name?
No. If you need to be transferred to a different domain, then 301 permanent redirect is more appropriate for you. Google now can only be recognized in different sub domain URL paradigm specified. Therefore, webmasters can www.example.com and example.com, and help.example.com each other specified paradigm, but not example.com and example-widgets.com each other, designated as a paradigm.

Sounds good, give me an example of what a reality?
We have a real example wikia.com. For example, you can find in http://starwars.wikia.com/wiki/Nelvana_Limited the source code, the page has been http://starwars.wikia.com/wiki/Nelvana specified for URL paradigm. Use the rel = "canonical" two page's PageRank is integrated calculation, to avoid the loss of distributed computing, the search results will only include the URL in the form specified by the site administrator.

If you fail to apply URL paradigm to specify the URL of your favorite, you do not worry, we will do our best to select a more optimal form of a URL, and prestige, and property values ​​corresponding transfer, as we have done before as (in English).

Added: this link tag now also support search engine Ask.com, Microsoft Live Search and Yahoo! Search.