Download the editable PDF. You can either print the poster at home on 11x17-inch tabloid paper or have it printed full-size (18x24 inches) at a copy shop.
Download the file, and save it to your hard drive. If you want the full-size poster, save it to a CD or flash drive to take to a copy shop. Before printing, type in your names and wedding date (unfortunately, changes made to editable PDF documents cannot be saved, so you can't make them in advance). If you're printing on 11x17-inch paper, select the "scale to print" option on your print menu.
The Details: We used a Le-Pen marker in teal (Amazon.com) for the signatures. After the wedding, you can frame the poster for display in your home; ours is an Ikea "Ribba" frame ($20 for 19 3/4x27 1/2-inch frame, ikea.com).