Create your own posters, as large as you want.

[Vidar]

http://homokaasu.org/rasterbator/

This is a little tool that will take any image, and turns it into a multi-page pdf that you can print, and assemble.
Just thought some of you might like this.

[xHaZxMaTx]

Oooh, nifty.  Can't see when I'd ever use it, but nice to know it's there if I ever need to.

[rabid_fox]

False advertising. My dream of creating a poster so large that it's an affront to god, visable from Mars, has still to be realised.

[Vidar]

The size is only limited by your computer, and the amount of ink in your printer. Go for it, young grasshopper.

[Ryudo Lee]

I've seen this before.  A friend of mine did a black&white of Gordon Freeman and put it up on his closet door.  Truly awe inspiring.

[Faux_Pas]

Handy!! I know i'm going to use it to wallpaper my room!! , also, might be handy for printing out that awesome mentos gum commercial with the package/gum wall art thing... except i think a picture of mab be nicer...