At the moment there are two open source projects driven and maintained by null-tech.com.
Moo Template Engine
The template engine allows bindings to observable models which can me the rendered elements
update themselfs when the models change.
C#, .NET and HTML5
A .Net-based server-side library for manage web socket connections. Web sockets are
a new concept in HTML5 which allows a client to establish a "permanent" full duplex connection
with a server over TCP. This gives the server the ability to push events and data
to the client, at any time, without the need for the client to make any request.