ISC keeps pushing the .NET web mapping front and has released MapDotNET UX Beta. MapDotNet UX Server has WCF-based web services and a WPF map and tile renderer. MapDotNet UX Studio includes advanced map design (XAML editing), support for shapefiles, SQL Server 2008 as well as ArcSDE ArcGIS Server and PostGIS and tile cache management.
ISC has some demos available to show the new MapDotNet UX in action. The beta is closed at this time, but interested developers who want to showcase WPF and Silverlight mapping are encouraged to apply. Another item to note is that the MapDotNet UX Studio will be free. ISC describes UX Studio this way:
It (MapDotNet UX Studio) was built with the WPF map control and allows developers/cartographers to develop their map configuration file (the .mapx), create/manage tile caches, perform data import/export to all of the support data types (SQL 08, SDE, PostGIS and Shapefile) and create starter Silverlight & WPF apps.
Of course their web services will still be licensed as normal. Some screenshots of UX Studio are below and I have to say they remind me of another product. ;)