What is Contained in .NET for Windows Store Apps?

When crafting a C# application for the Windows Store, you will see a reference to ,NET for Windows Store apps automagically added to your Project References. A quick dip in the Object Browser will show the new namespaces that proudly make up the new prefab units for Windows Store. Sample namespaces are shown below:

Microsoft.Advertising.Mobile
Microsoft.Devices.Sensors
Microsoft.Phone
Microsoft.Phone.Maps
Microsoft.Phone.Reactive
Microsoft.Xna.Framework
System.Numerics
System.Runtime.Numerics
System.Net.Http.Rtc