WPF Cross-Thread Collection Binding

From the rather excellent QuantumBit Designs there are a series of articles about multithreading and collections.

The "grand solution" can be found here: WPF Cross-Thread Collection Binding - Part 4 - The Grand Solution

Features
-Allows WPF to bind to a collection that is modified from any thread
-Allows WPF to bind to properties of items in the collection that are modified from any thread
-No lock required if used from a single worker thread
-Relatively simple (compared to some other attempts)
-Non-blocking

Downsides
-Requires two lists internally
-The ObservableCollection list should not be modified
-Disposable or DependencyObjects should not be used

I've implemented the ObservableList in the test project InABind but we haven't confirmed the overhead involved of using ObservableList in place of ObservableCollection.