My colleagues in the Workflow group maintain their own blog, with useful technical information about features, troubleshooting techniques, and other tips:
Workflow is an essential part of all E-Business Suite releases. Standalone versions of Workflow were released until about late-2007. Some of you have wondered what this means for the future of Workflow within the E-Business Suite's technology stack.
Vijay Shanmugam has just posted an excellent article that discusses our strategy for these two release streams. Workflow within the E-Business Suite is alive and well, with regular updates, enhancements, and new features planned: