I have written up a paper on the Public Services Broker architecture (PSB). It is available on the Reach website in the papers section.
The PSB is a Service Oriented Architecture for e-Government currently under construction in Ireland.
Over the next while, we will be publishing more documents about the architecture and the interoperability framework. A refresh of the interoperability guidelines (RIGS) is underway incorporating the feedback received.
All comments on the architecture overview or any of the RIGs welcome.