CoLab was launched at Open Science Summit 2010. It’s: “Designed for open and massively collaborative science“. [FriendFeed entry].
Comments: The focus is on unresolved scientific issues that are identified by members. So far, two issues have been contributed: “Locally optimal scientific research environments“, contributed on July 29 by A Garrett Lisi, and “How do you build an effective social sharing site for scientists?“, contributed on July 30 by Cameron Neylon. Both have attracted multiple comments.
There have been many Twitter trackbacks about CoLab (76 as of August 6th).
Be openly accessible or be obscure 