Haven't read the other responses, but here's what we did. First, instead of getting a crib my dad built us a cosleeper that fits a regular twin mattress. I LOVE this! I think everyone should have one, even for a singleton! The girls have been in their own room for almost 2 yrs now but we still have it up & won't be taking it down anytime soon. It means if one or both happens to wander into our room in the night there's still room for all of us, woo-hoo! Picture of it (probably the only time the bed's been made since the girls were born) here
We had a high 4 poster bed pre-kids so decided to drop the mattress/boxspring to the floor to make it easier to build the cosleeper & also to put the whole bed at a safer height for toddlers.
For the first year & a half, we started each night w/ one baby in bed w/ me & dh holding the other one on the sofa. Our sofa has a "recliner" in the end of it & dh determined that the way he felt safest sleeping w/ a baby was to sit in the recliner & have a pillow propping his arm up w/ baby sleeping on that arm. Being in the recliner meant he for sure wouldn't roll, which concerned him. Early on, if the baby he was holding woke he'd bring her to me & take the other baby back w/ him (on good nights the baby that was w/ me would have already nursed again by the time the baby w/ him woke so that she'd then sleep w/ him for a good long stretch). Once they got past the newborn stage, once the baby w/ him woke up he'd just climb in bed w/ all of us & we'd sleep w/ him on the outside edge, then the baby he'd been holding would sleep between us & the baby I started out the night w/ would be in teh cosleeper. I'd roll between the 2 babies as needed & often ended up sleeping on the "crack" between bed & cosleeper, but we survived.
At some point after they were a year old they were just getting too big for dh to hold on the sofa, so we started putting them both down on the cosleeper. We laid them "sideways" from the way you normally sleep in a bed & left room between them for me to lay between them to nurse whoever needed nursing.
Around 19 mo we night weaned, loosely using the method recommended by Dr. Jay Gordon (drjaygordon.com I think). By that age they were verbal enough to understand what we were saying & had gotten into the habit of wanting to sleep w/ a boob in their mouth, which meant I got no sleep. Night nursing jsut wasn't working anymore so we tried night weaning & it went well, so we followed through. If we'd tried it & it had been horrible, we would've muddled through w/ night nursing for another month or two & tried again.
Once we night weaned they were, w/in a few days, sleeping through the night most nights so we moved them each to a mattress on the floor of their room & that's where they still are (sometime we really need to put bedframes under those mattresses LOL). If they wake up in the night, they either fuss & one of us goes & gets the one who's awake & brings her into our bed (so she doesn't bother her sister) or more often, if one wakes up she just comes & crawls in bed w/ us. Alot of the time when this happens, dh & I will ask each other "what time did she get in our bed?" and neither of us have any idea, we don't wake up when they crawl in bed w/ us