It's in the dotlrn cvs tree. if you checkout the "dotlrn-core" alias you get it along with the rest, or you can check it out individually:
cvs -d :pserver:mailto:anonymous@dotlrn.openforce.net:/dotrn-cvsroot login
(hit enter)
cvs -d :pserver:mailto:anonymous@dotlrn.openforce.net:/dotlrn-cvsroot co new-portal