How Do I Support Someone Who Has a Baby in the NICU?

So, a friend of mine gave birth this week to her first baby, and there have been complications, so they are still in the hospital.  They were transferred from a hospital with a level 2 NICU to a hospital with a level 3 NICU, I'm guessing it's pretty serious.

They have family visiting from out of town to help, and I've already made a cassarole that I brought over prior to the baby's birth.  If they end up having an extended stay, I'd like to offer help, but I know that nebulous "Call me for anything" doesn't work.

If you have been in the position of an extended hospital stay because of a baby in the NICU, what were the things you needed help with outside of those walls?  Basically, what can I offer to help with so that they can focus on the care of their baby?