Add links to articles about collaborative learning -

Building Your Own Personal Learning Network 2009
Will Richardson
http://www.masscue.org/publications/oncuespring08/BuildingYourOwnPLN.pdf

Horizon Report 2009
http://wp.nmc.org/horizon2009/

Learning: Peering Backward and Looking Forward in the Digital Era 2009
Margaret Weigel, Carrie James, Howard Gardner
http://www.mitpressjournals.org/doi/pdf/10.1162/ijlm.2009.0005?cookieSet=1