The you will find the demos folder here C:\Users\Public\Documents\ECO Samples
The WCF-Talking-PersistenceMapperClient will work with Silverlight but it does NOT work it the build above. My guess is next week.
This contains enough to follow this article: http://theblog.capableobjects.com/2010/08/silverlight-viewmodel-usercontrol.html
Oh; and Jonas fixed the IIS-issue with the wizard, WCF for silverlight is still not there.