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This book was given to us by my sister, Bonnie. (Yay, Bonnie!) It is hands down the most beautifully illustrated alphabet book I have ever seen. It is also unusually entertaining, because each illustration contains not one, but several objects that begin with the featured letter. On top of that, the pictures from A to Z are interrelated and tell a kind of story from beginning to end. I recommend the board book edition (pictured) if you're going to share it with very young children. On a personal note, James loves this book.
Recommended for: Ages 0-5.
Curious George's ABCs by H. A. Rey
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The thing that's unique about this book is that the letters are actually worked in to the illustrations; the A becomes the shape of the alligator's mouth, the D is the belly of a dinosaur, and so on. It's a classic.
Recommended for: Ages 0-5.
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Dr. Seuss's patented brand of nuttiness, as applied to the alphabet. You can't go wrong!
Recommended for: Ages 0-5.