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Today we’re making a change to the way we categorize link data in Webmaster Tools. As you know, Webmaster Tools lists links pointing to your site in two separate categories: links coming from other sites, and links from within your site. Today’s update won’t change your total number of links, but will hopefully present your backlinks in a way that more closely aligns with your idea of which links are actually from your site vs. from other sites.
[edited by: Brett_Tabke at 2:02 pm (utc) on Sep 1, 2011]
[edit reason] added quote [/edit]
Google has recently made improvements to how we gather and display link data (for example, link counts now include links redirected using 301 or 302 redirects). As a result, you may see a change in the number of links displayed for your site.
Most people think of example.com and www.example.com as the same site these days, so we’re changing it such that now, if you add either example.com or www.example.com as a site, links from both the www and non-www versions of the domain will be categorized as internal links.