When my girls were born, a good friend gave me a book that proved to be an invaluable resource. It was Preemies: The Essential Guide for Parents of Premature Babies. That book explained all the things to expect in the NICU and explained in plain English every thing that we encountered with our preemies.
If you are the parent of a preemie or know someone with a preemie, I highly recommend getting a copy of this book.

Preemies: The Essential Guide for Parents of Premature Babies
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Yep, it was a really great resource.