Here are a couple of things that I've found that were (or would have been) invaluable to me as a Mom...
I didn't have one of these things but I REALLY wish I had! Every new Mom I know carries around a pad and paper to keep track of feedings and full diapers and sleeping patterns, etc. This handy-dandy invention means that you simply press a button whenever you feed the baby or change the baby and it starts to count the amount of time that passes until you press the button again. It even has a reminder as to which side you last nursed on.
4. Kangaroo Korner Adjustable Fleece Pouch
I tried a whole heck of a lot of slings from the Snugli-type carriers (which my husband preferred) to the kind you wrap around yourself again and again and in some sort of origami way create a pocket to carry the baby. Then, I discovered the Kangaroo Korner Pouch and I was in love. It was comfortable for me to wear, easy to put on (which, when you have a crying baby on your hands, is a necessity) and the baby felt secure. It was such a relief to be able to wear Sophie while doing dishes, making dinner (not near the stove, of course) and, most of all, chasing Morgan around!
3. Bib clips
This is a recent discovery of mine and I love it! Just pop one into the diaper bag and you can make any napkin or paper towel into a bib. It also converts a receiving blanket into a no-slip nursing cover-up.
I got mine at Diaper Bag Wrangler. She's also got some cute burp cloths, diapee and wipee covers and more handmade products!
2. Fisher Price Ocean Wonders Aquarium Bouncy Seat
I have no idea how parents got anything done before the invention of the bouncy seat. Seriously. I know some kids are not fans of the seat and prefer the swing but both Morgan and Sophie LOVED theirs. It was light and easy to move from room to room. The girls would sit in it while I showered, made dinner, folded laundry.
1. Boppy Pillow
I did a non-scientific poll of the Moms on my messageboards and the Moms I know IRL. Hands down, the Boppy Pillow was the single most mentioned must-have for new Moms. Whether you are breastfeeding or bottlefeeding, the Boppy provides a comfortable place for the baby to feed. It also can be used to prop the baby up when s/he begins sitting.