TopReference.com offer reference website links to browse for education, libraries, dictionaries, colleges, universities, k-12, language schools, book and magazines.

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A portal for KM projects with an emphasis on professional reference material to stimulate ideas and learning.
http://www.kmtool.net/
Portal offers links to resources, news, events, trends and developments.
http://www.kmcenter.info/
Provides a comprehensive directory and compendium of KM resources.
http://www.kmresource.com/
Provides information on tools, techniques and links to related resources.
http://www.knowledge-portal.com/
Collect, share, distribute, and analyse news, articles, publications, opinions on knowledge management.
http://www.metakm.com/
Portal features case studies, glossary, subject overview and links to related resources.
http://www.knowledgemedia.org/
Directory of categorized resources that features an article on the Structured Communication Model (SCM).
http://www.KMconnection.com/