I love to study at the Chem library; you can always count on someone sitting next to you to be exploring her O-chem or physics notes. It was the best place for me to do my chem homework not only because of its location, but also because the people around you can most likely be found in your classes. They are going through the same process of lab, homework, and midterm reviews.
I also like to go to the VLSB-Bioscience library to get school work done because the environment is so serene without being empty. And the computers are always around if you need to use them.
Last but not least, the new resource center in Mulford Hall is becoming one of my favorite places to hang out. The setting is not pin drop quiet, and if you need to take a nap, the comfy couches are right there waiting for you:)
So, explore around and you just might find your favorite places to study around campus.