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Google updated their “Webmaster Tools GData API” to allow you to get even more out of Webmaster Tools, such as setting a geographic location or your preferred domain. GData, it’s a protocol for reading and writing data on the web. The new features are:

• Crawl Rate: You can request that Googlebot crawl your site slower or faster. If you host may sites on the same server, updating all sites at the same time is now a trivial task.
• Geographic Location: If your site is targeted towards a particular geographic location but your domain doesn’t reflect that (for example with a .com domain), you can provide information to help determine where your target users are located.
• Preferred Domain: You can select which is the canonical domain to use to index your pages. For example, if you have a site like www.example.com, you can set either example.com or www.example.com as the preferred domain to use.
• Enhanced Image Search: Tools like the Google Image Labeler allow users to tag images in order to improve Image Search results. Now you can opt in or out for all your sites in a breeze using the Webmaster Tools API.

More info: Webmaster Tools GData API | Java client library | GData