Also- Google docs/calendar are awesome free tools. You can color code your calendar, add in your semester schedule, due dates, etc. Might seem a bit anal, but if everything is written down, you can purge that info from your brain.
With google docs, all of your classwork is a single click away from your gmail inbox, always backed up, always available, and you can download files into various formats (word, excel, PDF, etc). Note: For complex docs/excel files/powerpoint presentations, I recommend sticking with MS Office. You can always upload 'original, unconverted' files for safe keeping.