To switch to a graphical login (and back again), edit your \etc\inittab file, and find the line:
id:3:initdefault:
Change the 3 to a 5, and voila! You have a graphical login. Change it back to 3 and you're back to straight text. The # can actually be anywhere from 1 to 5, but whatever you do, DON'T make it 0 or 6! Your machine will end up shutting off right after boot... 🙂
Dave