The Odyssey--An interactive approach to Homer's Odyssey; part of The Classics Pages.
Monsters and Mythical Creatures
Classical Kids: An Activity Guide to Life in Ancient Greece and Rome by Laurie Carlson. Full of easy to execute craft and activity ideas.
Spend a Day in Ancient Greece by Linda Honan. Walk through a day with a fictional family, and along the way make some Greek food, make a peplos to wear, and shape a pot from clay. We got a lot of use out of this; Aimee made a complete girl's outfit, including jewelry, and Ben made a complete hoplite costume, as well as Poseidon's trident.
How Would You Survive As an Ancient Greek? by Fiona MacDonald. We liked the Egypt book in this series, and this one did not disappoint. Heavily illustrated and full of interesting details.
The Greeks by Roy Burrell. This is probably more suited to upper elementary or middle school aged kids (and up), but we found it readable and informative. Some chapters are written as interviews with a fictional character; these were my kids' favorites.
Usborne Book of the Ancient World by Jane Chisolm. This volume includes Early Civilisations, The Greeks, and The Romans. Like the Burrell book above, the level is probably for junior high or so, but Ben listened attentively to all I could find on soldiers and warfare, and Aimee enjoyed the pictures of hairstyles and fashions, among other things.
Ancient Greece Treasure Chest. This kit includes a piece of papyrus, a punch-and-assemble model of the Trojan horse, two games to play, a coin key chain, and a Greek language "decoder," among other treasures. Worth the money!