MESSENGER : a yearlong orbit of the innermost planet in March 2011

"MESSENGER launched on August 3, 2004, aboard a Boeing Delta II rocket from Cape Canaveral Air Force Station, FL. It returned to fly past Earth for a gravity assist a year after liftoff. The spacecraft has now completed two flybys of Venus and is on its way to Mercury. It will fly by Mercury three times before starting a yearlong orbit of the innermost planet in March 2011."
DISCOVERY ::: MISSIONS ::: MESSENGER
http://discovery.nasa.gov/messenger.html