.Net Development for Cross Platform use?

Could that be?

But, of course!

Grasshopper 2.0 Technology Preview 2, a plug-in to the Microsoft Visual Studio development environment, which introduces support for .NET Framework 2.0. Use C# 2.0, ASP.NET 2.0 controls and generics to develop Web applications and deploy them on Linux and other Java-enabled platforms. The Visual Studio 2005 debugger makes it easy to attach your Web application to Java and control its execution!