Credit to fellow ADE Lucy Gray for posting these to her blog!
* Free Online Graph Paper from Incompetech.com
Make PDFs of just about any kind of paper you might need in a school setting here. This site is not just about the graphing kind!
* PDF Pad
This is a fairly basic graph paper generator that allows you to specify type of paper and size.
* Downloadable Graph Paper and Measurement Tools
Not only can you print graph paper at this math and science site, but you can also find printable measurement tools such as centimeter rulers and protractors. It looks like other math and science resources cited here might be worth browsing as well.
* Graphing Worksheets from Teachnology
This site includes printable graph paper as well as graphing activities.