Press Here by Herve Tullet is so much fun to read. It's hilariously low-tech and so creative. I thought my daughter might get bored with it after the first few readings, but ah....no, definitely not.
It's also a welcome change from the let's! have! an! adventure! books that are so heavily marketed to pre-schoolers. Basically the book instructs readers to "press here" and the yellow dot multiplies, gets bigger, gets smaller and moves around with each subsequent page. It's a fun way to talk about size, color, number, right/left, up/down, etc without being all teacher-ly about it. 
What books are you and your family enjoying lately?