0.7mm mechanical pencil
college ruled notebook paper - either spiral bound or loose, though I tend to not use all the pages in a notebook.
Currently a student studying Computer Science/Multimedia Studies
I only use pens for forms, writing checks, and when I can't find a pencil.
Edit: I should note than when I have the choice, I prefer to use a computer to write things down. I type much, much faster than I can write, and there aren't any worries about legibility. This route isn't always an option though, particularly during classes.