Interested in .NET internals?
You can now see how the compilers are built, how GC works and how the .NET Framework is laid out. All in all, I think this is a good trend.
There are some who believe that source code is the best documentation. Others would like to have access to source code as one of several tools in their development toolbox. And others still, just don't care about the guts of the platform -- public APIs are good enough for them.
I'm curious about how you have used or intend to use this CLI source. Please drop a comment.