Additionally, if you're student, you'll probably want to take notes all the time. You could just take notes in a text document through OOo, but I prefer to use
Google Notebook for its ability to organize your notes in a logical way. The only downside to this method vs. using OOo and Dropbox is that you can not work on your notes without an internet connection unless you save them to your computer. But internet access is almost everywhere, especially if you're on a college campus, so that can hardly be considered a shortcoming for this method.