Author Mitali Perkins put together a good list of children's books about and set in Haiti, at her blog, Mitali's Fire Escape. She writes, "Stories can bring faraway people and places from the screen into our homes and hearts, and keep them there, even through information overload or compassion fatigue." I can't say it any better than that.
The Rumpus details a number of ways to help in Haiti.
A teacher in Haiti—and one of my kid-book-blogging friends—whose site is There Is No Such Thing as a God-Forsaken Town, says, "Things are worse than anyone can imagine. Our whole family is fine and our house and school are standing and apparently undamaged. 14 others at our house." She asks for our prayers.