Logitech Solar Keyboard Folio
Carrying an iPad around campus is easier than lugging a laptop, but you still need something better to type with than the onscreen keyboard. There are a lot of iPad cases with keyboards out there, but we like the Solar Keyboard Folio ($129.99) for second- and third-generation iPads.
Powered by light (it says "solar," but lamplight works too), the keyboard doesn't drain your iPad's battery or require replaceable batteries. (Logitech claims that a fully charged keyboard will work for two years in total darkness.) The case wakes your iPad when opened, and holds it mostly upright for typing or at a shallow angle (with most keys blocked but media controls still accessible) for watching videos.