Now that both src and test support multiple folders specified by the user. It'd
be really cool if for a given user specified src/test dir, she can exclude some
sub dirs and possibly individual java classes during build and dist of the project. 

This would be helpful, for example, if the user starts off with a web project;
some where down the road, she throws in an EJB in the same version controlled
source folder. Now to port her project in NB, she'd use "web with existing
sources" for the webapp, and "EJB with existing sources" for the EJBs.... Now
it'd be real nice  if she can exclude the sources for the webapp from the
sources of the EJB project, wouldn't it? But the all sources share the same
version controlled dir....

This feature is useful in all NB project types - j2se, j2ee, ....

Layman comments: It doesn't seem complated from the Ant implementation point of
view, does it? <javac src=".." excludes="..."> ...</