OpenSolaris 2008.11 has a new feature called graphical boot. We call it internally the "Smiley face". Unfortunately this otherwise cool feature has one big problem - if you disable gdm and boot with the graphical boot you won't see the command line prompt. Which is why there is a second option in GRUB called the "text boot" which will work as the old regular text boot.
The nice thing about graphical boot is that it doesn't show you the command line prompt when you boot into X11, so beginners will not try to login in text prompt before X11 comes up (I've seen that happening a few times). This is however quite useless on a server, which is why you can choose the second GRUB option and make it default if you want.
Btw, I was wondering where the "smiley face" idea came from and saw this picture - do you also see the resemblance? :)