Download this poster to have some of the tips from "GIS Cartography: A Guide to Effective Map Design" at-hand for easy reference.
It dresses up an office wall nicely. Just click on the thumbnail image to access the full-size version.
It's 18" by 24" - Arch C - so you'll need to use your large-format printer.
Poster Design: Susan Murray
Map Design: Gretchen Peterson