Recent blog post: Here
Quote:
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Originally Posted by Google Webmaster Central Blog
A search for www.site.com returns URLs that begin with www and a search for site.com returns URLs for all subdomains. (So, site:google.com returns URLs such as www.google.com, checkout.google.com, and finance.google.com).
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This is something new to me
Quote:
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Originally Posted by Google Webmaster Central Blog
Historically, Google has avoided showing pages that appear to be duplicate ...
However, with a site: command, searchers are likely looking for a full list of results from that site, so we are making a change to do that. In some cases, a site: search doesn't show a full list of results even when the pages are different, and we are resolving that issue as well.
Note that this is a display issue only and doesn't in any way affect search rankings.
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Some useful information here 
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