NetFx Live designer
http://www.netfxlive.com
JS based workflow designer is a new designer writen in JavaScript for pure declarative scenarios only. It is not a rehosted designer and does not need WF assemblies to be installed on the client. This should evolve into an ASP.NET ATLAS control that anyone can drop on his aspx page.
Netfxlive is an intent to make a central activity repository. The purpose is to provide a live workflow designer where anyone can build a workflow base on all activities uploaded to the repository. Activity developers will be able to upload their activities and thus share its functionality or expose the interface of a WCF service through it. (Custom activity with Silver activities) Workflow activity declarations, rules and binding capabilites are powerful enough to build complex business logic on top of a world wide share of activities. WF appears to be a nice interface for service discoverability. (UDDI like service through a WF live designer)