I had this pillow (EZ to Nurse Twins) and it was WONDERFUL! Before I bought it, I had a hard time nursing both at the same time (trying to get the pillows just right,etc). This pillow puts the babies at the perfect position everytime.
I had this one too, and it was a lifesaver. It used to be available at a few stores in Canada, but I hear from new twin mommies in my local POMBA group that they're no longer available here. By the way, if you haven't joined your local POMBA (Parents of Multiple Births Association), do it now - it's a great resource for information, support, and new friends who know exactly what you're going through.