RHogue has posted a couple more samples that are interesting.
The StockGraph3D sample has a reusable List3D control for laying out a list of items in 3D. It also shows how to use databinding to wire up data (in this case stock data from a web service) to this control. He also does some nice things with visual brushes and with 3D animation. Be sure to read the readme.txt to understand more about the app.
The Video3D sample shows 5 different videos playing simultaneously on different meshes.