MRO, a.k.a. the Mars Reconnaissance Orbiter, just got into its science orbit. As a result, you should expect to soon see a flood of new images and other interesting data coming back from Mars (adding, of course, to the goodies already coming back from MGS, Odyssey, and the MER rovers). Anyway, I thought this would be a good time to get folks up to speed on the MRO spacecraft, the instruments it carries, and the mission of exploration that it is only now really starting.