I’ve finally gotten around to making a nice factorization diagram poster:
You can buy high-quality prints from Imagekind. (If you order soon you should have them before Christmas! =) I’m really quite happy with imagekind, the print quality is fantastic and the prices seem reasonable. You can choose among different sizes—I suggest 32"x20" ($26 on the default matte paper, + shipping), but the next smaller size (24"x15", $17) is probably OK too.
If you have ideas for variant posters you’d like to see, let me know (though I probably won’t be able to do anything until after the new year).
Note that Jeremy also has a variety of factorization diagram posters for sale.
For more information, including links to the source code, a high-resolution PNG, and other things, see this factorization diagrams page.