Hmm...
> we (NASA) aren't going to Mars any time soon...
Mars Exploration Rover-B Opportunity is currently on Sol 2813 of its 90-Sol mission, preparing to hibernate the long Martian winter. 2001 Mars Odyssey is in the 10th of its 14-year mission, orbiting Mars. The Mars Science Laboratory (Curiosity) is enroute, due to arrive on August 6th, 2012, for a 686-day mission, but its RTG PSU should last for 14 years.
True, there are no planned /human/ missions to Mars, but humans are squidgy and easily damaged, need more resources than robots, and are about 10x more expensive in missions.