When we first brought our girls home, they slept in our room together in one pack 'n' play. We divided the night into shifts. I went to bed in our bedroom right after SuperSam did, around 7:30 pm, and slept until the girls woke up to nurse sometime after midnight. George (or one of our amazing helpers) kept the girls out in the living room or in their bedroom and gave them a bottle around 10:00 pm.
After about 8 weeks, we moved them to a full-size crib, which they shared in their own room. We also had a double bed in their room, where George and I took turns sleeping.
The girls shared their crib until they were just past 6 months old, when they really started to need their own space. They rolled over each other in the night, and no one was resting well. We put up a second crib in their room and took out the double bed.
I hope that as they grow up, The Sisters will feel that sharing a room is a positive thing. They've been sharing space since conception, after all...they don't know any different.
Do your children share rooms? How do you have things set up?