NServiceBus
Udi
Dahan on CQRS at TechEd 2010 (video)
Pluralcast
27: CQRS with Chris Tavares (podcast)
In this article we've just touched on the surface of CQRS.
To learn more, I highly encourage you to play with the NServiceBus samples, and
watch the video and/or listen to the podcast above. Although CQRS is not
currently mainstream, it is a mature pattern that has been used successfully in
many high-scale web applications. I'm currently implementing it for an
application that serves hundreds of requests per second and am already seeing
benefits.