"Compiler as a service" in C# 4.0

[Nick Sabalausky]

"Bill Baxter" <wbaxter at gmail.com> wrote in message 
news:mailman.7.1262710304.4461.digitalmars-d at puremagic.com...
> This blog post points to part of a talk by Anders Hejlsberg at PDC
> talking about where they're going with C# 4.0:
> http://dobbscodetalk.com/index.php?option=com_myblog&show=C-Sharp-4.0-with-a-REPL-Read-Eval-Print-Loop-.html&Itemid=29
>
> The part of this vid
> http://channel9.msdn.com/pdc2008/TL16/
> which he points to at 60 minutes talks about the "compiler as a service".
>
> It's an idea which has been mentioned here many times, so I thought I
> would post this link.  Very cool that C# is going to make this idea a
> reality.
>
> --bb

I thought C# compiling was already part of the .NET library...?