SciTopics launched by Elsevier
Last fall, Elsevier launched SciTopics. It is a web site devoted to providing research summaries of current topics by experts, allowing for public interaction through comments. Anyone can become a member and post comments, or request to author a page.
In many ways, it resembles iMechanica. Authors pen SciTopic pages in their area of expertise. SciTopics leverages Scirus , which is Elsevier's free, science-specific search engine.