I finally scanned in my entire collection of Stanislaw Lem book covers. Most of them are not in great condition (as I've read them,) but they're there!
I scanned them in because Mr. Lem's son (Tomasz) hosts http://www.lem.pl, a site about Stanislaw Lem. There is a special section of his book covers. Finally, after four years, I finished scanning them in. You can see them at http://www.brainkandy.org/pics/lem, but they might not stay there for too long.