somehow my VS does point to the wrong feed ... what is the feed address ... not easy to find
In visual studio, go to Tools menu -> library package manager -> package manager settings.
Earlier Visual Studio configuration for NuGet 1.2 points at https://go.microsoft.com/fwlink/?LinkID=206669
This link resolves to http://packages.nuget.org/v1/FeedService.svc/ (don't use this, just for verification)
Update In Visual Studio 2013, I get https://www.nuget.org/api/v2/ (as "Available package sources") and https://www.nuget.org/api/v2/curated-feeds/microsoftdotnet/ (as "Machine-wide package sources")
(Thanks @mheyman)