At the recent Pubcon Matt Cutts has announced that Google will begin to start treating subdomains like a normal folders.
In a few weeks Google will roll out a new filter that will look to allow a maximum of 2 results per domain to be returned in any given search. There will of course be exceptions to this rule for sites such as blogspot.com but it should look to halt the results ownership some big sites have held and open the doors to a more relevant results list.
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