A B757-200 FLC FAILS TO CHANGE TO TWR FREQ FOR LNDG CLRNC AT PIT.

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WHILE ON VECTORS FOR A CAT IIIB APCH TO RWY 10R AT PIT; WE WERE GIVEN A CLRNC FOR THE APCH AND INSTRUCTED TO CONTACT TWR AT THE LOM. AT THAT TIME THE FO DIALED UP THE TWR FREQ ON THE #1 COM BOX IN PREPARATION FOR THE XFER FROM APCH CTL TO TWR. CLRING THE RWY AFTER LNDG; THE FO SWITCHED TO GND CTL AND REALIZED TWR WAS NOT CONTACTED ON THE FINAL APCH. THE FO WAS THEN ASKED BY GND CTL IF HE HAD HEARD THE LCL CTLR; TO WHICH HE RESPONDED 'NO.' WE WERE THEN GIVEN A TAXI CLRNC TO OUR GATE WITH NO FURTHER MENTION OF A PROB. IT WAS AT THAT TIME I REALIZED THAT WE HAD LANDED WITHOUT HEARING A LNDG CLRNC. AS THE CAPT OF THE ACFT; I TAKE FULL RESPONSIBILITY. I BELIEVE THE ERROR WAS CAUSED BY DISTRS DURING A PERIOD OF A HVY WORKLOAD. I (PF) AM RESPONSIBLE FOR CALLING FOR THE LNDG FLAPS AND A CONTINUATION OF THE LNDG CHKLIST AT THE GS/OM INTERCEPT POINT. THIS ALL HAPPENS WHILE MONITORING THE NAV DISPLAYS (ADI; HSI) AND SELECTING/DIRECTING OF A LOWER AIRSPD FOR THE NEW FLAP SELECTION. I THINK WITH ALL THAT IS GOING ON IN THE COCKPIT; IT WOULD BE MORE HELPFUL IF APCH CTL WOULD GIVE A DEFINITE CLRNC OF 'NOW' TO SWITCH OVER TO TWR INSTEAD OF A DELAYED ONE. WITHOUT HAVING A DELAY; I DON'T THINK THE FREQ CHANGEOVER WOULD HAVE BEEN MISSED. NOTE: I FEEL THAT THIS SIT WAS MY FAULT AND FEEL VERY FORTUNATE THAT A GAR WAS NOT REQUESTED DUE TO A RWY OBSTRUCTION. SUPPLEMENTAL INFO FROM ACN 418657: AS PLTS; WE ARE EXPECTED TO FLY FIRST; COMMUNICATE SECOND. IN THIS CASE; THE COMS WERE NOT FOLLOWED UP. IN THE CAT III ENVIRONMENT INVOLVED; WE WERE STILL ON APCH CTL TILL SWITCHING TO GND CTL. WE COULD HAVE BEEN CONTACTED BY APCH. CLRNCS TO CONTACT TWR; IN RADAR VERSUS NON RADAR ENVIRONMENT; AT A POINT IN THE FUTURE START TO OPEN THE 'CHAIN.' WE COULD HAVE GONE TO TWR EARLIER TO THE DETRIMENT OF APCH CTL IF THEY NEEDED US. THIS SEEMS TO BE A SIMPLE COMS BREAKDOWN; AND I'M GLAD THAT A GAR WAS NOT REQUIRED DUE TO A RWY OBSTRUCTION.