Maybe you ever told your friends: Oh Microsoft steals everything from Apple. Even the new GUI-Concept for Longhorn was first used in OSX.
So come and see what Avalon is really about:
“Avalon” is the code name for the presentation subsystem class libraries in WinFX. Avalon provides the foundation for building applications and high fidelity experiences, blending together application UI, documents, and media content, while exploiting the full power of your computer. The functionality extends to the support for Tablet and other forms of input, a more modern imaging and printing pipeline, accessibility and UI automation infrastructure, data-driven UI and visualization.”
Source 1: http://channel9.msdn.com/ShowPost.aspx?PostID=67522
Source 2: http://msdn.microsoft.com/longhorn/understanding/pillars/avalon/default.aspx