We’ve just released version 2.3 of the development package.
The big new feature is complete support for .Net 4.0, but there are also many other minor fixes and improvements included.
Release notes:
- Support for .NET 4.0.
- Now targets .NET 4.0 by default in all samples.
- Better Mono Support: Console-only interface when running the server in MonoDevelop (for instance, on Mac OS X).
- You can force console mode with the “force-console” commandline argument to the development server.
- You can force gui mode with the “force-gui” commandline argument to the development server.
- Support for C#-style events.
- Support for C# generics with “new()” constraint.
- System.Attribute added to whitelist.
good work
makes life easier 
thx