When I scanned the art originally posters were my intention as well. And the image resolution is sufficiently high enough to fit on A1, or even A0 I think. However, its a touchy subject - I myself can get them printed on A0 or A1 for a paltry £10, but there is a copyright issue. If anyone did
make posters, they would have to get them printed themselves, and not make any
profit from them. My conscience is clean, anyway - if LucasArts made official box-art posters I'd buy them (like the FOA one) - but they don't.
I would stick them on a website, but each image is around 15Mb. This is because the plain image looks... well, not so great - not bad, but could be better. So I apply a few imaging effects and voila:
Actual Size sample of original image
Actual Size sample of edited final image
You already told me about the DVD covers and it sounds pretty cool