It has been planed for years now NIS+ has been removed from the development branch of OpenSolaris, soon all that nistbladm(1) skill will be obsolete. Since it integrated in time for b129 the first Solaris without NIS+ will be OpenSolaris 2010.03. If you still use NIS+ you can continue to use it as long that you stick with Solaris 10, but it might be time to start planing the migration.
NIS+ End-of-Feature (EOF) Announcement FAQ
PSARC/2009/503 Removal of NIS+
Talks I have given
2 weeks ago