I'm always looking for things to do in the Valley and especially now that we have Zach, fun things to do with kids. I found "The Arizona Mama's Handbook" in Barnes and Noble, and it's full of fun things to do with kids, they have 2 for the Phoenix area, one for the East Valley and one for the West Valley, it's full of suggestions like museums, parks, water fun, and even includes some shopping recommendations. They also have the book for CA, NV, UT, WA, and TX.
It's only $10 if you get it through the Today's Mama website, and if you use this coupon code: 50HB then it's only $5, pretty good deal for a round-up of kiddie activities! Plus there are coupons in the back for local businesses, that and the info definitely make this book worthwhile!