Print your own graph paper

 

Cory Doctorow: Free on incompetech.com, printable PDFs of graph paper in a variety of styles: "Metric, Multi-Width, Asymmetric, Dots, Iso-Dots, Hexagonal, Hex Dot, and Celtic Knot." Man, if only we'd had this stuff back in my D&D days. Link (via Make Blog)

Graph-paper in PDF form