Some of this depends on if you're interested in the overall architecture which the points above aim at, or if you're more interested in the development of specific components within your SOA e.g. methodologies for developing specific services on your ESB etc.
I'm most aware of IBM's SOMA http://www.ibm.com/developerworks/library/ws-soa-design1/
I'm sure there are others and will add them in. Here is a starting point with some suggestions: http://it.toolbox.com/blogs/the-soa-blog/serviceoriented-architecture-soa-methodology-12022
Some of this depends on if you're interested in the overall architecture which the points above aim at, or if you're more interested in the development of specific components within your SOA e.g. methodologies for developing specific services on your ESB etc.
More details and links for further reading at: http://www.ibm.com/developerworks/webservices/library/ws-soad1/