Here are my thoughts on what are the best books out of the ones I've reviewed on this site.

Definite "must haves" for your personal library
The Agony and the Ecstasy
A Death in the Family Agee has a great writing style.
The Discipline Book Read this even before your child is born!
The Ender books The Ender series, yes. Shadow series, maybe.
The Harry Potter series Completely engrossing!
Married for Better, not Worse A great book on marriage relationships.
The 7 Habits of Highly Effective People Great book for "life" management.
To Draw Closer to God
Uncle Tom's Cabin
Watership Down This book is so fascinating and written so well it is definitely worth reading multiple times.

Books you should read at least once
Fahrenheit 451 Social commentary on censorship.
The Foundation series
The Healing Drum
The Moonstone
Misquoting Jesus A well written book on errors in the New Testament.
Touched by Sound Adventures in drumming!

Read these for fun
Around the World in 80 Days A fun, quick read.
At Home in Mitford
The Bourne Identity Totally gripping!
The Big Year
The Cat Who...series Owning at least two or three of these would be nice, too. (Of course we have all of them so far!)
The Life of Pi What would you do on a lifeboat with a tiger?
Robin Hood: Prince of Outlaws
The Westing Game