http://www.nasa.gov/mission_pages/ca...huygens-1.html
The Cassini-Huygens was launched some time in 1997. Some time around last xmas, the Cassini spacecraft releassed the Huygens probe on a direct impact course for titan. Today, it finally got there.
http://www.esa.int/SPECIALS/Cassini-...OI71Y3E_0.html
That link leads to more information as to how the probe was supposed to go down to the surface.
After firing off Huygens, the Cassini probe made a deflection maneuver to prevent from plunging into Saturns largest moon as well. For the rest of its operational life, it will orbit saturn and learn as much as it can.
More information can be found at
www.nasa.gov.