Lots of receiving blankets! Our twins can't sleep unless they are tightly swaddled. We never experienced this with our older dds, so I wonder if it has something to do with their tight quarters in the womb.
I love my Moby Wrap. Luckily, both babies love it too. I usually wear one at a time so that I can carry the other one. When dh is home, he wears one in his Bjorn. I also have a hotsling, but right now I need the security of a wrap until they have better head control.
We have a co-sleeper, but the babies have yet to sleep in it. They just share our bed. I'm sure we'll use it eventually.
Medela PIS or other high-quality pump. Mine was indispensible during the first six weeks. DD was a sleepy nurser and DS was slow to gain, so I had to pump after each feeding and syringe-feed both babies. Now they are nursing like champs and the pump is packed away.
I have the EZ pillow, but usually it's just easier for me to nurse them together with a sofa cushion or a boppy. I feel so constrained when that big honkin' pillow is belted on me. Plus, I've never liked the football hold, and it seems that's the only hold I can do when I use that pillow.
We have two swings and two bouncers, but I think we really only need one of each. My babes are 11 weeks old now and prefer tummy time to the swing anyway, so I can park them on a blanket on the floor when I need to occupy them for a few minutes.
Not sure if you will use binkys, but they make our babies happy, so we use them. We have HABA wooden pacifier chains that we attach to their outfits. They are so cute, and it is nice to know where their binkys are at all times and we don't get them messed up.
Congratulations on your pregnancy!