Pinterest - Community Death Note boards of varying categories. You may contribute a pin.
Rebelmouse - Collating news about Death Note from all over the place, making it look pretty.
Google+ - Linking all the articles posted at Death Note News in a pretty array.
People who know how to get hold of editor Matti IRL hang out here:
He Moves Me Differently forum - For discussions regarding It Matters MxM fan-fiction with those who know it better than her, plus other Death Note fandom tales, art, chats and events with an leaning towards Mello and Matt.