Gizmo.ObservableTypes (nuget): A set of types that extend and enhance the databinding functionality in WPF/Silverlight/WinRT.  There is currently only one type: ObservableFilter - A configurable filtered ObservableCollection intended to act as a replacement for filtering that was present in WPF but isn't in WinRT. (For when you don't want to include Rx either)
Keywords: inpc|inotifypropertychanged|observablecollection|observable|filtering|filter|winrt|wpf|silverlight|wp8|windows|8