"The difference:... During the romanian, you maintain the arch in your back and hinge forward at the hips while keeping the bar in contact with your legs. This minimizes the involvement of the lower-back muscles (erector spinae) while maximizing the use of the hamstrings and glutes.
With the stiff-legged version, you bend forward at the waist (flexing the spine) and keep the bar farther out in front of you. This maximizes the use of your spinal erectors, and lessens the involvement of the hams and glutes"
I'm still fairly confused... :-S
http://www.muscleandfitness.com/workouts/workout-tips/deadlifting-difference
"The difference:... During the romanian, you maintain the arch in your back and hinge forward at the hips while keeping the bar in contact with your legs. This minimizes the involvement of the lower-back muscles (erector spinae) while maximizing the use of the hamstrings and glutes.
With the stiff-legged version, you bend forward at the waist (flexing the spine) and keep the bar farther out in front of you. This maximizes the use of your spinal erectors, and lessens the involvement of the hams and glutes"