This blog has moved to http://blogs.msdn.com/b/appfabric please update your links!
Continuing on the theme of Workflow 4.0 blog, this blog post talks about the enhancements and features provided for debugging in Workflow 4.0.
The blog post talks specifically dwells into the seamless debugging between the Xaml view and the Designer view of the Workflows. Most of the features provided in Workflow 3.0 Debugging re still provided as well. Also, please be on the look out for the blog post as to how you can use the DebugService now public in Workflow 4.0 for creating tools like Simulators, Monitoring and Re-hosted Debugging.