glenn_block··on Scriptcs gets a REPLlinqpad is great. scriptcs is more than a REPL, it provides an end to end experience for authoring full apps as C# script.
glenn_block··on Using Node.js in an ASP.NET MVC application with iisnodeAs cjfront is saying, Socket.IO supports Web Sockets, Flash sockets and long polling. The nice thing is it detects the capabilities of the browser and gracefully degrades.