WAKE TURB -- ACR HITS THE WAKE OF ANOTHER ACR ON SHORT FINAL APCH.

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DURING VISUAL APCH TO RWY 34 AT SALT LAKE INTL AT APPROX 100-200 FT AGL; WE ENCOUNTERED WAKE TURB FROM A B-757 THAT WE HAD FOLLOWED AT 4 1/2 TO 5 MI. CAPT ADVANCED PWR TOWARD GAR AND FLEW OUT OF THE TURB AND THEN MADE AN UNEVENTFUL LNDG I THE TOUCHDOWN ZONE OF RWY 34. CONTRIBUTING FACTOR MIGHT HAVE BEEN THE RAPID XING OF OUR RWY THRESHOLD OF 2 B-737-300 AT HIGH THRUST JUST MOMENTS BEFORE WE ENCOUNTERED THE TURB. THE EFFECT OF THE TURB WAS A RAPID ROLL TO THE R OF ABOUT 20 DEGS FOLLOWED BY ONE TO THE L ABOUT 20 DEGS AND A SLIGHT DSCNT FORCE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR SAID THAT EVERYTHING SEEMED TO BE GOING FINE. THEIR B727-200 WAS A LITTLE TOO CLOSE TO THE PRECEDING B757-200; BUT THE CREW WAS STAYING ABOVE THE GS AND THEY WERE IN SMOOTH AIR. AS THEY WERE APCHING THE RWY HOWEVER; THE CAPT ALLOWED THE ACFT TO SETTLE BELOW THE GS WHERE THE WAKE WAS WAITING. THE RECOVERY WAS WELL DONE; ACCORDING TO THE FO. THE LNDG WAS SOMEWHAT FIRM AND THE ATCT LCL CTLR ASKED IF THE WING MOVEMENT WAS DUE TO NORMAL TURB OR WAKE. ONE OF THE PAX COMPLAINED AT SOME LENGTH ABOUT THE CREW'S FLYING TECHNIQUE THIS PAX ALSO APPARENTLY COMPLAINED TO THE FAA ABOUT THE LNDG AND THE COMPANY TALKED TO THE CAPT; BUT THE RPTR WAS NOT CONTACTED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO ON 314086: RPTR PARTICIPATED IN THE WAKE TURB CALLBACK PROGRAM. RPTR STATED THAT THIS TURB WAS THE SHARPEST AND MOST JOLTING OF ANYTHING HE HAS EVER BEEN IN. HE FELT THE CAPT DID A GOOD JOB OF MAINTAINING CTL OF THE ACFT AND LANDED IN THE TOUCHDOWN ZONE OF THE RWY EVEN THOUGH HE APPLIED ALMOST FULL PWR TO FLY OUT OF THE TURB. THE LNDG WAS HARD ENOUGH THAT 1 PAX WANTED THEM GNDED AND ASKED FOR ALL THEIR NAMES AND CERTIFICATE NUMBERS. THIS RPTR HAD TO MEET WITH THE COMPANY'S CHIEF PLT TO EXPLAIN THE SIT. RPTR STATED THAT THERE WERE 2 B-737-300'S THAT HAD TO HURRY ACROSS RWY BEFORE THEIR ACFT TOUCHED DOWN; AND SPECULATES THAT THOSE 2 ACFT MAY HAVE ADDED TO THE EFFECTS OF THE WAKE TURB. THEY MAY HAVE MOVED THE B-757 WAKE CLOSER TO THE LNDG B-727 OR CREATED THEIR OWN TURB WITH THE JET BLAST ACROSS THE RWY.