Some interesting new development tools and platforms are available these days.
Microsoft is providing beta versions of its Visual Studio 2005
Mono is an open source IDE for developing .NET client and server applications on Linux, Solaris, Mac OS X, Windows, and Unix. from http://www.mono-project.com/
Grasshopper is a Visual Studio .NET plug-in which enables you to use C# or Visual Basic .NET to develop, debug and deploy Web applications and Web services that run on Windows, Linux and any Java-enabled platform. The Developer version is available free from http://dev.mainsoft.com/Default.aspx?tabid=130