NASA's Mars Science Laboratory left Earth (♁) on November 26 2011, and will reach Mars (♂) tomorrow. The landing will take seven minutes, but since radio signals take about 14 minutes to reach Earth, it will be already over when we start hearing about it.
You can find information about the craft and live coverage on NASA's official website for the mission, at solarsystem.nasa.gov.
The spacecraft contains a rover called Curiosity, which is as big as a car.
Rendezvous tomorrow, at 1:30 AM EDT (7:30 AM in Paris).
Where is Curiosity rigth now ? Check it out on nasa.gov/mission_pages/msl/news/WhereIsCuriosity.html.