There's a lot of good suggestions here. Basically, I have seen second grade teachers read Beverly Cleary's Ramona series, Charlotte's Web, and Mr. Popper's Penguins (which students REALLY get into).. There was also a teacher at our school who read Hoot by Carl Hiassen. Time Warp Trio is also neat, yet I don't know if I'd use it for a read-aloud because it's written on their level. For second grade read-alouds, I'd recommend third and fourth grade level books. I know so many people mentioned Junie B. Jones and said this would not be the ideal read-aloud, yet Barbara Park has written some other great books like Skinnybones. That may be appropriate as well. Books I read in fourth grade are Walk Two Moons, The City of Ember, My Side of the Mountain, Sarah, Plain and Tall, and a variety of others, like books from Andrew Clements.