Brady Anderson has released the first version of his multicast DNS responder written in C# for the Mono and .NET platforms. This is the foundation for implementing rendezvous-like functionality in your applications. [via Mono Project News]
This is an example of Open Source adding a critical pieces of infrastructure to .NET that doesn't currently exist (in a sense an embrace and extend). The community isn't waiting for a .NET Frameworks implementation to clone, instead it has implemented this using Mono, which by implication means availability under Microsoft .NET.