I have a wealth of experiences
(gosh, I hope that doesn't sound arrogant!)
Sometime people ask me questions, or for advice. and I just LOVE giving my opinion. Doesn't everyone?
I received and email from a friend, who has another friend who just had triplets, and she was asking me for recommendations on what might be a good gift.
Just so I can answer this question again with out having to retype the whole thing from scratch, here is what I said:
Practically speaking - depending on what type of person she is (what she'd be comfortable with) a gift cert for a post partum doula or even a maid service after the babies are home might be a unique touch that would be greatly appreciated. That'd be on the higher $$ amount though... providing meals for her or organizing a group of people to bring them meals every other day for a couple weeks can really make a big difference between total chaos and a little bit of sanity!
I was shocked at sheer amount of diapers and formula you can go through with twins. With my two babies and 2 yr old, we were averaging 20 diapers a day for the first month. A large container of formula from Costco would last us about 4 days. Diapers.com is a great way to go for that kind of thing - you can google to find a $10 off first order coupon code.
For something that would last a little longer - we go through a lot of bibs and burp cloths.
For something more fun - I found a playmat/baby-gym for the boys for Christmas that is extra large - about 3 1/2 ft wide by 4 1/2 ft long. I had even thought that it would fit 3 or more babies. Boppy's and Bumpos are great too... places to safely park the babies is important when you only have 2 (or even 4) hands.