Valleys of Mars
As if in response to that lovely hill shot the ESA today released the first high resolution image from the Mars Express orbiter (which is working quite well despite the loss of its rover, thank you very much). This image depicts the undulating canyon region, Valles Marineris. ESA has a press release with their own versions of this shot but unlike NASA they make it very hard to find unadulterated versions of their images and I grabbed this one from Space.com (ESA still gets the photo credit, though).