Hi all, 
I'm seeing a lot of KnowledgeAgent related questions in this list. That's why I made 2 posts explaining a little bit the new implementation (since 5.1 I think). In these posts I cover the incremental change-set processing of resources preformed by the agent. 
The first post is a high level description and the second post is aimed to developers. Any feedback will be appreciated!

http://ilesteban.wordpress.com/2010/03/25/knowledge-agent-incremental-change-set-processing-and-binary-diff/
http://ilesteban.wordpress.com/2010/05/26/knowledge-agent-incremental-change-set-build-implementation/
 
Best,

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Esteban Aliverti