Okay, since some of the links are broken in D-Squall's topic, I decided as I replayed the game this summer, I'd take a pic of all the secret rooms. MM2 is done now! Enjoy:
http://www.mediafire.com/download/485vg1knttw1wu9/Millennium+2.rar
You can find MM3 Secret Rooms here:
http://www.aldorlea.org/officialsite/phpBB3/viewtopic.php?f=149&t=9134