I have been looking for a decent MI poster for months, I've just made one myself.
I found a hi-resolution picture of the cover on the internet, corrected it with the gimp ( erased the disgusting "Computer Minimal Requirement" sticker )
Then I sent it to a online photo developping company. I received it today, and it rocks
When I was seeking it, I went on this board, for information, so I guess everyone like me will come here one day, so : I SHARE
There is the picture i used to be the poster.
This is a picture of the final result, I received it today by postmail. I put it in a wooden frame. ( sorry for the flash light reflexion on it, it's under glass )
The final result is 50 cm * 70 cm ( that does 19,7 x 27,55 inches )
For information, I added black up and down layers, because the proportion of the poster did'nt fit in the size asked by the photo developping website. If you plan to frame it, you should do the same, if not, just cut the white border of the final print.
Enjoy it ! I already enjoy mine
The full story ( in french ) on my http://blog.regne.net