Grids and the Service-Oriented Architecture (SOA) are two systems that appear to be on a collision course. The SOA is a standard for building discrete services, potentially across multiple machines, which can be combined to build an application that reduces integration costs. Most modern grids employ Web services like the SOA, but there is more to merging the two systems than simply employing Web services. You must also adjust the architecture of your grid solution. This article explains the concepts behind SOA and what you should consider when moving your grid applications toward an SOA model.
Distributed Tiger: Xgrid comes of age
And to get a start on Xgrid as the above article says:
Integrating Xgrid into Cocoa Applications
