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Pat Helland proposes that SOA is basically just HST - hooking shit together. IMO, this will be most true at the enterprise level where the need to connect disparate systems dominates.

However, when it comes time to develop new systems, SOA is not so much HST but rather more like RSA - ripping shit apart. Here, the developers and architects are concerned with taking "The System" and ripping it apart into discrete, well defined, loosely coupled, stateless services.

So, I guess that SOA = HST + RSA;