The New Horizons Probe has finally been launched after 2 days of delays. This is a probe to Pluto which is the only unexplored planet in our System.
It is to reach the moon in about 9 hours, then mars in about 3 months followed by Jupiter in about a year. A slingshot maneuver around Jupiter will send it on its 8 additional year journey to Pluto.
You can find the other planetary missions at nineplanets.org