Obsessive Compendium of the Original Supes ^ An almost scholarly tome that I found myself reading sections from randomly when the mood strikes - this is surely a must for the fervent Superman fan and an interesting read for general comics aficionados.
Terrific, if out of date ^ This book is essentially a complete encyclopedia of Superman's adventures up through the mid-1960s. The Superman section alone is worth the price of purchase, never mind the other 400 or so pages.
Of course, it has little or no relevance to today's Superman and the characters with the same name, but if you have a fondness for the Golden and Silver Age versions of the character, get this book. I'm glad I did.
Invaluable Tome ^ This book is an invaluable tome of cross-referenced historical information covering every aspect of Superman's origin, his history, countless other characters in the mythos (including his friends, enemies, and lovers), and the mythology of Krypton. It is a labor of love and deserves to be in print.