Very fast presentation. Expecially the blend tricks were awesome - but hard to keep track of everything.
Would like to see the source code too
Especially the integration of the webservice stuff in the portable class library would be interesting to see. IN VS2012 you cant add ServiceReferences if your lib is configured as WP8+W8 unfortunately.
Mapping of WebService-imported classes to your internal (ViewModels) classes is unfortunately not possible inside the PCL if you dont see the service classes there.