http://www.ftponline.com/channels/arch/2006_11/pvarhol/

Eventually....Mono implements the ECMA 334 and 335 standards: these are the Common Language Infrastructure (CLI) execution engine and the C# language, respectively.
It includes the updates to the C# compiler, support for generics, updates to the core class libraries and the System.WinForm namespace, and the Mono debugger. In addition, this release adds generic types support in the C# compiler; execution system and core class libraries (a feature of C# 2.0); System.Windows.Forms 1.1 support; the Mono debugger, gtk# 2.0 (which also includes support for gtk 2.6); and various scalability and performance enhancements.
Mono supports a wide variety of hardware platforms and operating systems. The 32-bit ports of Mono include the x86 architecture, Sun Microsystem's SPARC, the embedded ARM processor, and the IBM S390 mainframes. On 64-bit, Mono supports the Itanium, the s390x, and the x86-64 architecture, with ports for other platforms following closely.