I want to thank Pete Brown and David Pugmire for putting this together. As always, TechEd was a terrific experience and the product teams were incredibly supportive.
As Pete suggests, check it out yourself (http://cloud.cogentdatahub.com/Silverlight/DataHubWebViewDemo.asp). The demo runs in the cloud so you can play with the designer from anywhere.
I'd be happy to answer your questions. Feel free to comment on the post or email me directly at firstname.lastname@example.org.