The Big Picture, my favorite new blog to come around in ages, has 17 of the most remarkable high res images from Mars you're likely to see. It includes everything from detailed photos of the surface to photos from above to animations of dust devils, and you've really got to see it. Above is a high-res pic of the Pheonix lander taken about a week ago, where you can clearly see its arm scooping up Martian dirt for analysis. Amazing. Be sure to follow the link to see the other 12 pictures.
@Rabid Penguin: People aren't oohing and ahing at the pictures themselves. If these same exact pictures were taken in some desert in the midwest, then no one would care. People care more about the lengths taken to get these pictures. Again, a picture taken on a planet on the farthest possible frontiers of the galaxy can be absolutely banal compared to any great shot of nature on earth, but that picture matters just as much because it's still showing a great deal more in existence than we did prior. It's not for aesthetic value, it's purely for our adventurous spirit.