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WPF and WPF/E are the first step.  I watch a lot of Channel 9 videos.  In the past month or so I’ve seen not one, but two open admissions that Microsoft is looking at bringing C# and .NET to other operating systems.  Doing so would, in my mind, remove THE major barrier for .NET adoption.  Of course it’s possible they’d just bring C# over to support WPF.  Time will tell, but of course I’m hoping for full-blown .NET. 🙂