We at Red Hat has been working on the next generation Eclipse tooling for BPMN2 with Codehoop. Here is a video from the most recent M3 release, it’s looking very sexy and Codehoop have done an excellent job on this.
http://vimeo.com/22021856
You can read more about the BPMN2 editor here:
http://kverlaen.blogspot.com/2011/02/new-bpmn-20-eclipse-editor.html