Acumen Business has added support fow Windows Workflow Foundation in their Business Analyst friendly Rule Manager product. Acumen's solution went up on Microsoft's Solution Showcase site a few weeks back.

In addition to the InRule support that also came online in April, WF Rules users now have multiple options for choosing a business analyst interface for creating and managing rules. This also goes to say that the WF Rules Platform is extensible enough for ISVs to add custom authoring and management frameworks and integrating into their products.