modularizing a big project

[Aurelien]

I have a huge set of classes that, for convenience, I'd like to group 
into functional units (http://objc-
jxta.jxta.org/source/browse/objc-jxta/); having 286 files in the same 
folder like I have now is just not practical.

Among other things, that would allow me to have a more concise view of 
what's done and what's left to be done.

How can I have sets of classes grouped in such a way that I can:

1) have directories in the cvs tree with sets of classes ?
2) #include them in the source by groups with statements like "#include 
<jxta/api/Codat.h>" or "#include <jxta/impl/Codat>" ?

Aurélien