One of the best baby products I've come across is " The Happiest Baby on the Block", a book by Dr. Harvey Karp. The book is available at most bookstores, and a DVD is available on the website. Harp's idea is that newborns still need a fetus-like environment the first few months of life to help keep them calm. He has done his homework on the subject, and acknowledges how traditional cultures have soothed infants for thousands of years. This is in comparison to the normal idea that infants have "colic", caused by gas or other problems.
I use Karp's techniques on an almost daily basis, and they have been a tremendous help. I highly recommend this book for any new parents.