I don't understand what you mean. Do you mean cool F# things? All the work of Tomas Petricek is way cool. Outside of .NET there is of course tons of cool stuff, like Clojure, Rails, Haskell stuff, the recent fuss about Yacc is Dead etc.
I'm trying to see why the things coming out of the Clojure and F# community are cool, but they aren't coming out of the C#/Visual C++ community. For example, ScottGu showed off a C#/Silverlight app built by a 3rd party that was a 3D model of the human body, where you coudl strip layers and interact in real time... all rendering pushed to the GPUs. That seemed cool to me. And they did it in a week.
I'm trying to understand why we have this disconnect.
But take a look at a place like CodeProject. People post their projects and write up an article describing the technical aspects of that project. It's actually a surprisingly strong community. In the past month ~500 written or updated. I actually tend to find this place more interesting than GitHub or CodePlex, due to the exposition.