NASA have an excellent website set up to promote the incredibly innovative ARES mission to Mars. Standing for "Aerial Regional-scale Environmental Survey", the ARES is an unmanned aircraft capable of travelling upward of 800 km once delivered to the planet. It's a beautiful looking aircraft, and while it is still only on the drawing board, one can only hope that the mission gets a chance to fly. The site has a wealth of material and some fantastic animations and mockups of the craft. Check it out at the ARES homepage.