ZBW CTLR DESCRIBED FSS FAILURE TO RELAY IFR CANCELLATION WHICH COULD HAVE CONTRIBUTED TO SEVERAL UNNECESSARY DEP DELAYS.

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ACFT INBOUND TO PQI ON VISUAL APCH. ACFT GIVEN CANCELLATION INSTRUCTIONS AND RADAR SVC TERMINATED. SEVERAL ACFT REQUEST DEP CLRNC. I HAD SUPVR CALL FBO AT PQI TO SEE IF X HAS LANDED. FBO RPTS ACFT ON GND AND GETTING FUEL. I ISSUED DEP CLRNC TO Y (HE DEPARTS) THEN Z (AND HE DEPARTS). SEVERAL MINS LATER X CALLS ME AIRBORNE REQUESTING TO PICK UP HIS IFR CLRNC. I ISSUE CLRNC. THE FLT SVC CALLS ME AND TELLS ME THAT X CANCELED HIS FLT PLAN AT XA24. I ASKED X WHEN HE CANCELED HIS INBOUND FLT PLAN AND HE TOLD ME WITH THE WX BRIEFER BUT THAT THE PLT WAS 'SPEAKING TO SOMEONE IN GA AND HE WASN'T SURE WHO TO CALL.' THANKFULLY; I HAD NOT CHEWED OUT X (YET?) FOR FAILING TO CANCEL INBOUND AND POSSIBLY DELAYING OTHER OUTBOUND FLTS; BUT THE FAILURE OF FSS PERSONNEL TO PROMPTLY CANCEL FLT PLANS AND/OR PROVIDE TIMELY ATC INFO IS DEPLORABLE. THIS IS CERTAINLY NOT THE FIRST TIME THAT WE'VE HAD THIS PROB IN MY AREA. WE'RE JUST GETTING SO FED UP WITH IT (AND REALIZING THAT IT'S NOT AN ABNORMALITY) THAT I'M FILING THIS TODAY.