My personal favourite children's book of the moment is Augustus and his Smile. Even if it does give me a huge lump in my throat every single time I read it out loud.
The tale of a tiger, who looses his smile and then finds it again. I love it for it's message of finding happiness in the everyday. I can't think of a lesson I would rather my boys learned. And when they can do so, with lyrical language that is a joy to read out loud and wonderfully nuanced illustrations, it's even better.
Catherine Rayner, the author and illustrator came to give a talk at the bookshop last night. She brought her sketchbooks - I could happily have spent days looking through them and listening to her speak about the process of bringing an illustrated book into the world. There is a great interview with her here, along similar lines.
Joy is a very precious commodity, and there is nothing better than to come across somebody whose work simply oozes with it.