Google Bookmarks List, Google Friend Connect, Google Gears, Google Search Timeline, Google Wave, Google Knol, Renewable Energy Cheaper than Coal (RE<C) are going, going, gone. via Google Wave, Knol and five more Google initiatives getting the axe | ZDNet.
Google intended Knol to meet Wikipedia’s collective editing strategy by enabling a network of experts to create a basis of solid, verified information. Unfortunately, Knol never on the way Google hoped. Google has worked with Solvitor and Crowd Favorite for Annotum, an open-source publishing platform with a similar design philosophy to the soon-defunct Knol. Google Knols Move to WordPress: The Annotum Platform