Dragos Manolescu's orchestration patterns site now has draft content on-line and an RSS feed. Dragos is taking a high-level pattern-oriented view of orchestration, including runtime, design-time, management, and philosophical considerations. Orchestration, as services from services, will pick up speed as a prerequisite for reuse and recombination in service-oriented architecture, so I'm looking forward to seeing this body of work evolve and expand. (I might even find the time to contribute a pattern or two.)
Note that Dragos's work on orchestration patterns is not to be confused with the work of Wil Van Der Aalst on so-called "workflow patterns" (which would be more correctly called control-flow patterns). Wil's work takes an internal view of control-flow in process description languages with an eye to classifying existing languages (like BPEL) and finding a triple point where the expressiveness and efficiency of process description languages is simultaneously maximized.
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