PlayStation Blog. It's worth noting because of how the site has grown up under the leadership of Social Media Manager Jeff Rubenstein and the nameless/faceless behind-the-scenes folks at Sony's US PR operations. Since its inception, the site has helped humanize Sony's messaging and worked well in creating a better community among Sony's devotees.
The US PlayStation.Blog is working so well, in fact, that it's clearly the template for the recently launched European PlayStation Blog (which thankfully put two bullets in the back of Three Speech's head). So, congrats to the US PlayStation Blog team! May they have many more years of blending the line between corporate mouthpiece and community site.