From my experience, on SOA projects reuse was mostly accomplished with technical services/ infrastructure services. However, it is the business service reuse that we are struggling with as the Lines of Business (LoB)/ business units feel that their sub-set of the business logic is very unique. The problem is that most of these business services are rendered non-reusable due to the fact that they include both business logic and process sequencing logic into the same code base and it is the later that is unique to the LoB and not the business logic. Also, we have achieved greater degree of reusablitiy in terms of data access and informational services and not so much business function services that are a higher level class of services.
I would like to hear about what your experience has been with regards to service reusablity. Have you been able accomplish this.