I have just read six of the Elephant and Piggie books. They are awesome.
Mo Willems (of Don't let the Pigeon Drive the Bus and Knuffle Bunny fame) writes for young ones. His easy reader books starring Gerald and Piggie are probably my favorites. These books are on the reading level of Dr. Seuss or Berenstain Bears books, but lend themselves to much more dramatic readings. I captivated Benjamin (now 7 months old) and Spencer (13 months) with my reading of I Am Invited To A Party! Seriously, these books are so funny. Just imagine. . . no. No. Don't imagine. Just go read them. Sweet, cute, spunky, hilarious. Excellent for anyone, perfect for kids in Kindergarten and 1st grade.
Oh, and two Elephant and Piggie books were recently shortlisted at the Cybils, and Mo Willems just won the 2009 Theodore Seuss Geisel Award for Are You Ready to Play Outside? Rock on.