The Creative Family by Amanda Blake Soule -- A book for the creatively challenged family. Most of it you could probably make up yourself or find on the internet.
I Love Dirt! by Jennifer Ward -- A book for people who like to be outdoors and aren't sure what to show their kids while they're there. Some good ideas here.
Understanding Exposure by Bryan Peterson -- A book for people who want to take better photographs. I learned a ton from this!