The first beta version of Novell/Ximian's Mono .NET implementation is
available; see the release
notes for the details. There's a lot of stuff there, including a
C# compiler, the runtime virtual machine, support for several
architectures, various database adaptors, a "complete cryptography stack,"
Apache integration, and more. Regardless of whether one agrees with Mono's
goals, it looks like an impressive body of work.