Hi L. -
My daughter was born at 28 weeks and was 3lb, 3oz. We did need preemie clothes, but were limited in what she could wear while she was in the hospital due to the monitors, IV's, etc. The layette type bag sleepers (open at the end) were usually OK to wear, or you can find special NICU 'approved' clothes from shops online. We needed a few when she came home (4lb 9 oz), and newborn clothes. Most of what we had received as gifts were 0-3 and larger and were WAY too big.
As far as needing 'different' things, as long as they don't go home on oxygen, monitors, or other special equipment they don't really need anything different than normal babies. The best thing that I had that was a big help was the baby bath tub that I had - it was from The First Years called Sure Comfort Infant to Toddler tub. It had a sling that attaches to the tub that cradles babies so they don't slip and tip over like they would reclined in the tub itself. It was great!
Other than that, just normal baby stuff. Toys, books, etc. If you want to do something for mom, I agree with some of the other gals - gift cards for places to eat near the hospital - esp. if she is staying nearby and they don't live close enough to go home at night. Gift certificates for places that deliver or have take out. Places like Main Dish Kitchen (http://maindishkitchen.com/locationhome.asp) allow you to pick up 'home made' food for dinner that night or to put in the freezer to have when they want it. I know you said that you weren't close enough to deliver meals, but what about doing some up ahead and freezing and taking to her. Would she have freezer room for them? I had some people do that for me for #2 and it was nice. Days that I was just too tired to cook I could pull one out and dinner was done.
Sorry this is so long, but I hope it helps. Feel free to contact me off list if you would like.
J.