I spent last Saturday participating in Greg Young's DDD/CQRS weekend. Greg provided a helpful, all-day-long overview of Domain Driven Design, Command Query Responsibility Segregation and the ways these concepts can be applied to an existing architecture or greenfield project.
I took 17 pages of notes throughout the day which you are free to download [CQRS DDD Notes Greg Young.pdf (449.24 kb)].
For more information about DDD and CQRS, check out the DDD/CQRS Google Group.
Tags: CQRS, DDD, Domain Driven Design, Event Sourcing