I just spent a silly amount of time trying to find the default logins for Opensolaris 2009.06. The website lists the defaults as jack/opensolaris, but when the screensaver kicked in those credentials didn’t unlock it. After a bunch of trial and error, jack/jack worked. Also- if you boot directly to the console, a username and password of jack/jack log you in, while the supposed default of jack/opensolaris doesn’t.
Just in case it helps anyone!
Kris