The only dictionary/thesaurus you'll ever need. The entire dictionary is on your phone and includes "Word Of The Day" to help you improve your vocabulary and pronunciation (though that feature needs Internet connectivity). Good luck arguing with your teacher to let you use your iPhone during the test.

We all know wikipedia is the first place you go for research. It's ok though, I'm pretty sure teachers go here first too. The only difference is that students aren't very smart about finding a more respected place to actually cite after finding the information on Wikipedia.

Chances are good that a fair number of books you'll be forced to read in your classes are old enough that they're freely available online. Stanza delivers over 50,000 free books like that straight to your iPhone. There's also Classics, which costs 99 cents and only offers a few classic books, but the app looks gorgeous.

Evernote is awesome if you have an iPhone 3GS and not too bad if you have an earlier iPhone or iPod Touches. Why? Evernote takes a few seconds to launch on earlier iPhones and is not ideal for quickly jotting down a note. In addition, the camera on the 3GS is much better than the earlier iPhone. As a result, the text recognition in Evernote makes it a breeze to take a snapshot of a syllabus or assignment. As long as the text isn't really tiny, all your assignments for the semester should be easily searchable. What was that teacher's policy on late assignments? How many pages was that paper supposed to be? It's just one quick search away.

If you don't like Evernote or want something an app tailored a little better just for textual notes - definitely go with Simplenote. It features seamless free web syncing so you can access your notes instantly whenever you get to a computer. The interface is clean and it works really well.

No matter what the class, at some point your teachers will be talking about something and won't have a good visual representation of whatever they're talking about. If you're a visual learner, that just won't do. Use the fullscreen search on Cooliris to find nice big photos of virtually anything.