Projects will not be typed, monolithic things.  There will be no such thing as a "Java project" or "C++ project" per se.  Rather, there will be project 
modules that provide the services necessary to create various types of files, edit them, and produce deliverables.  For instance, the Java project module 
will provide services that let the user find and edit libraries, and that give source files access to those libraries.  Services will be exposed to the end user 
with project  components.  These components are displayed, in the UI, as the kinds of nodes we've been talking about.  In the Java projects example, 
the library services would use the Libraries node to give the user the UI machinery needed to deal with libraries.  The projects infrastructure will provide 
the infrastructure that project modules need in order for services to get attached to components, for components to communicate with one another, and 
so on.