Sony Ericsson is adding on to their GreenHeart line of greenish cell phones with a new release, the Cedar. Just two years ago, the GreenHeart line held only a concept phone, but now it is several models strong as Sony Ericsson focuses on designing cell phones with ever smaller footprints. The Cedar features business practicality with social networking tools necessary for any mobile device these days...and it has a few nice green(er) features we can appreciate.