Flight Crew Air Transport Pilot (ATP)
Situational Awareness; Training / Qualification
Ground Event / Encounter Aircraft
Human Factors
Upon entering the ramp; I saw a ramp agent who waved me in to follow him to a parking spot located on the eastside of the Ramp.   As I taxied down the back alley; the ramp agent who waved me in went over to the top of the parking spot and continued to wave me in.  There were no ramp agents monitoring as wingwalkers.  There was a female ramp agent approximately 25 FT in front of the airplane to the right side of it with her arms down at her sides facing the airplane.  The route to the parking spot had two fuel trucks; one red one and one yellow one on my right and Company aircraft parked on my left as I taxied in.  As I taxied in between the fuel trucks and the other aircraft; the front of the left wing appeared to clear the tail.  As I then continued forward I saw the rudder trim tab move and immediately stopped the aircraft.  The ramp Agent who was marshalling me from the top of the parking spot; came over to the left wing and inspected it then gave me the symbol to shut the engine down; which I did.  The passengers were unloaded and escorted into the terminal.  Another ramp agent came over and went into the other aircraft; released the parking brake and pushed it forward. Once pushed forward; it's front tire was even with the painted T.  Always stop the aircraft and demand wingwalkers whenever there are other obstructions in the vicinity of the intended path of the aircraft instead of relying on your own judgment of the clearance.
Captain reports contacting the wing tip of another company aircraft with his rudder while being marshalled into a parking spot.