Defined:
Enterprise Social Software Wikipedia

Blogs:
Dion Hinchcliffe
Andrew McAfee
Fast Forward Blog
Bill Ives
Jerry Bowles
Many2Many Corante
Ross Mayfield
Stowe Boyd

Articles:
Enterprise 2.0: The Dawn of Emergent Collaboration Sloan Mgmt. Review
Web 2.0 has Corporate America Spinning Business Week
Tech Pros Wary About Web 2.0 Tools in Business Information Week
Military Intelligence Goes Web 2.0 Computerworld
Open Source Spying New York Times Magazine
Preparing for Intranet 2.0: how to integrate new communication technology into your intranet ’“ Kathleen Gilroy and Bill Ives
Intranet Social Bookmarking: Playing Tag Behind the Firewall ’“ Bill Ives

Events & Conferences:
Enterprise 2.0 (Boston)
Fast Forward (San Fran)