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"Google Information for Webmasters"
"My site's listing is incorrect and I need it changed.
2. I migrated my website to a new URL.
If you've changed your URL, or plan to, and would like Google to display your new URL, please keep in mind that we can't manually change your listed address in our search results. That said, there are steps you can take to make sure your transition is smooth.
If your old URLs redirect to your new site using HTTP 301 (permanent) redirects, our crawler will discover the new URLs. For more information about 301 HTTP redirects, please see
http://www.ietf.org/rfc/rfc2616.txt. Google listings are based in part on our ability to find you from links on other sites. To preserve your rank and help our crawler find your new URL, you'll want to inform others who link to you of your change of address. To find a sampling of sites that link to yours, perform a link search by entering "link:[your full URL]" into the Google search box. To find more pages that mention your URL, perform a Google search on your URL and select the "Find web pages that contain the term" link. Also, don't forget to change any entries you may have in directories such as Yahoo! or the Open Directory Project.
Finally, you may submit a list of your new URLs through the Google Sitemaps (Beta) program. Google Sitemaps uses webmaster-generated Sitemap files to learn about your webpages and to direct our crawlers to new and updated content.
Sometimes during site transitions, we'll fail to find a site at its new address. Just be sure that others are linking to you, and we should discover your new site. If you've changed your URL, or plan to, and would like Google to display your new URL, please keep in mind that we can't manually change your listed address in our search results. That said, there are steps you can take to make sure your transition is smooth.
If your old URLs redirect to your new site using HTTP 301 (permanent) redirects, our crawler will discover the new URLs. For more information about 301 HTTP redirects, please see
http://www.ietf.org/rfc/rfc2616.txt. "
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