ACS Nanotation
From the American Chemical Society, the goal of ACS Nanotation is to be "the premiere destination for nanoscience and nanotechnology news and highlights." It includes Nano Picks (commentary and reviews of the most important findings), Ask the Scientist forum, ACS Journals in Focus (links to the latest articles in ACS journals), Multimedia (podcasts, images, and videos), and a Wiki for collaboration. Access is free, but registration is required to search for other users, submit videos and images, and edit the Wiki.