Books I have found useful:

 General KM

*Common Knowledge – Nancy Dixon
 

*Learning to Fly – Chris Collinson & Geoff Parcell
 

Intellectual Capital – Thomas A. Stewart
 

Know Your Value – Mick Cope
 

Building a Knowledge Driven Organisation – Robert H. Buckman
 

*Knowledge Unplugged – Jurgen Kluge, Wolfram Steen, Thomas Licht
 

*The Knowing-Doing Gap – Jeffrey Pfeffer, Robert I. Sutton
 

The Knowledge Creating Company – Ikujro Nonaka, Hirotaka Takeuchi
 

*If only we knew what we know – Carla O’Dell, C Jackson Grayson Snr.
 

*The Knowledge Management Fieldbook – Wendy R. Bukowitz, Ruth L. Williams
 

The Knowledge Activists Handbook  - Victor Newman

Social Network Analysis/Communities of Practice

*The Hidden Power of Social Networks: Understanding How Work Really Gets Done in Organizations  – Rob Cross

Communities of Practice: Learning, Meaning and Identity (Learning in Doing: Social, Cognitive & Computational Perspectives S.)  - Etienne Wenger

Social Network Analysis – John Scott
 

The Future of Knowledge, Increasing Prosperity through Value Networks – Verna Alllee
           
Knowledge Networking-Creating the Collaborative Enterprise – David J. Skyrme
 

Who Really Matters: The Core Group Theory of Power, Privilege and Success – Art Kleiner 

Not specifically KM, but useful

*The Empty Raincoat – Charles Handy
 

*The Structure of Scientific Revolutions – Thomas S. Kuhn
 

*Change Without Pain – Eric Abrahamson