A short sample demonstrating that it's a piece of cake to mimic the latest Expression Blend diagrams (part of Sketchflow) in G2.
The latest addition (in the WPF futures) to the official WPF project on CodePlex is related to the MVVM pattern and refers to this article of The Orbifold. I remember well, I wrote this article on December 12th 2006 (three years ago!) and I don't think it's in any way particularly important. Also, rather strange that it's only now that MVVM (and all things related to that) gets much attention...maybe WPF finally gets some momentum in the enterprise?
About some customer challenge, multi-dimension data visualization and a custom WPF control which allows you to visualize ANY type of CSV/spreadsheet data.
About a little annoyance in XAML.