Mars Odyssey, Spirit, Opportunity and the Mars Reconnaissance Orbiter.
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Two natural satellites. Phobos and Deimos.
There is as well three manmade satellites: Mars Reconnaissance
Orbiter, 2001: Mars Odyssey and Mars Express.
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The "Mars Reconnaissance Orbiter" was sent to Mars in August
2005, arriving there in 2006.
The probe "Mars Science Laboratory" and its rover, Curiosity,
were launched on November 26, 2011 and were scheduled to arrive at
Mars in August, 2012.
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Mars' moons are Phobos and Deimos. No other known natural
objects are orbiting Mars. But humans have sent three satellites
into orbit around Mars. Mars Express (ESA), 2001: Mars Odyssey
(NASA) and Mars Reconnaissance Orbiter (NASA).