The official documentation is at: http://docs.alfresco.com
Enterprise Content Management Learning Resources
Enterprise Content Management is a big space. This area provides documentation on the ECM space which will help you understand the context of the Alfresco product and project.
Articles on ECM
Note: I've seeded this section with links to John Newton's blogs. The articles here should grow in number. We should maintain articles both in and out of alignment with the Alfresco vision ECM. Articles that are not in line could then be annotated to highlight divergence from which we can evaluate our current course and correct if necessary. Categories need some work...
What is ECM
Content Management 2.0
Enterprise Content Managment Services
Making ECM Easier
Common Security for ECM
Ontology Overrated - There is NO Folder
On Choosing a Query Language for ECM
State of the Industry
Commoditization of ECM