Our kids are loving the Berenstain Bears lately! It's one of those books that works for both a 3 year old and an almost 5 year old, so we're going with it.
Our eldest also likes Dr. Suess books, but that's a harder sell for a 3 year old so we're leaning more towards Stan and Jan for now. Also, "I want my hat back" is a crowd pleaser.
What children's books are your kids loving lately?