I know I’m a little late to the game, but I’ve been reading about SOA, what it is, how it’s implemented, etc. Here are some really useful links:
http://www.whatissoa.com – A book publishers high-level overview, the author covers the big basics like:
* Service-Oriented Architecture (SOA)
* Services and Service-Orientation Service Compositions
* Service Inventory
* A Conceptual View of Service-Oriented Computing
* A Physical View of Service-Oriented Computing
I also found a standards body that offers a certification at http://soaschool.com/.