One of my favorite photo collections from the 1990s is compiled in a book called, "Earth from Space". This is a set of earth images taken by astronauts with high resolution gear, and it's beautiful to me.
Now there are several online versions of the same idea. The image to the left comes from "Big Blue Marble: Next Generation" (no, not the television show with the great song). Click on the image to see a much nicer view. The website Earth from Space has a decent interface, and many of those images, and more, are also found at Visible Earth.