Learning CQRS? A while back, Mark Nijhof posted a helpful series of blog posts along with an example project. It's a great place to start for understanding the concepts and implementation details of Command Query Responsbility Separation. If you've been on the CQRS bandwagon for a while, this is old news for you. But for more recent adopters, you'll find this to be a helpful introduction.
Code Sample - http://github.com/MarkNijhof/Fohjin
Video Walkthrough of the Code Sample - http://vimeo.com/7838858
CQRS à la Greg Young - http://cre8ivethought.com/blog/2009/11/12/cqrs--la-greg-young/
CQRS Domain Events - http://cre8ivethought.com/blog/2009/11/20/cqrs-domain-events/
CQRS Domain State - http://cre8ivethought.com/blog/2009/12/08/cqrs-domain-state/
Specifications - http://cre8ivethought.com/blog/2009/12/22/specifications/
CQRS Event Sourcing - http://cre8ivethought.com/blog/2010/02/05/cqrs-event-sourcing/
CQRS Event Versioning - http://cre8ivethought.com/blog/2010/02/09/cqrs-event-versioning/
CQRS Scalability - http://cre8ivethought.com/blog/2010/02/09/cqrs-scalability/
Using conventions with Passive View - http://cre8ivethought.com/blog/2009/12/19/using-conventions-with-passive-view/
Tags: CQRS, DDD, Domain Driven Design, Event Sourcing