Thank God I'm not the only one!
I actually just noticed today, but with the other poster (which I think resembles Harry Potter even more!): http://www.dmae.upm.es/cienciaficcion/cartelera2004/EnemigoMio/archivos/imagenes/B000059HAC.01.LZZZZZZZ.jpg
yep, as soon as i saw the harry potter poster i thought, "wait a minute..."
Today I was on Apple's site and started going through all the new HP posters. As I stopped on the last one, I instantly thought of Enemy Mine. A quick Google search and up came your site!
Glad to see I'm not the only one who has a pointless memory. I remember thinking Enemy Mine was pretty lame when I saw it.
That was my first thought when I saw the poster.