A Look-it-Up Guide to the Gods of Mythology (Mythlopedia)All three of us really enjoyed these books.There are four in total (Oh My Gods, She's All That, All in the Family, What a Beast - gods, goddesses, heros, and mythical creatures, respectively). These books are humorous, with fun illustrations, quick facts and related myths. Great as a quick reference, and also a good read in short doses.
Update - we perused these books throughout the entire year, and enjoyed them every time.
D'Aulaires' Book of Greek Myths is a classic introduction to Greek mythology, and is beautifully illustrated. Each god has his story told, as do various nymphs and minor gods.
Books are a wonderful way to experience new worlds and ideas. Our house is filled with books, most of which are borrowed from our public library. Public libraries are an incredible resource, making books accessible to everyone, and we highly encourage everyone to discover theirs. If you are hoping to build your own home library, I've made it easy by including a link to Amazon.com in the titles. Please note that I have become affiliated with them, and would receive a small commission.