OK, this has GOT to be one of the most fun uses of technology that I’ve seen in quite a while!
The U. S. Geological Survey used images taken by the HiRISE camera on the MRO (Mars Reconnaissance Orbiter) at Mars to make some really impressive computer-generated flyover movies. In particular, these “virtual flyovers” are of the terrain around the two MER rovers’ current locations. Aside from the sheer fun of watching the movies, it’s felt that they’ll help the rovers’ human handlers better choose future paths for them. The movies may also help in understanding some of the geology of Mars — in particular, the gullies (possibly carved by water) that show up inside many of the larger martian craters.
More details, and links to the movies themselves are on the New Scientist website here. Note that one’s 2.8 MBytes, and the other 4.4 MBytes in size — so you might not want to download these via a dialup connection.