NASA/JPL's MSL was launched successfully on Nov 26, 2011. It was very excited as I was watching it live as the telemetry came down. It's now on its way to Mars, exploring the unknown. The Entry-Descent-Landing (EDL) in August 2012 will be especially exciting.
In this picture are the 3 generations of Mars rovers: the smallest one was Mars Pathfinder's Sojourner rover. The middle one was Mars Exploration Rover's Spirit and Opportunity rovers and the largest one is Mars Science Laboratory's Curiosity rover and the rover weights 1984 lbs (900 kgs) and is the size of a Mini Cooper automobile.