A B757-200'S PITOT HEAT; WX RADAR; BOTH EADI'S; 2 FUEL PUMPS AND BOTH THRUST REVERSERS FAILED AFTER TKOF. AN EMER WAS DECLARED WITH RETURN TO LAND.

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WE WERE ONLY ON DUTY FOR APPROX TWO HOURS BEFORE THE INCIDENT OCCURRED; AND WERE WELL RESTED. I DO NOT BELIEVE THAT FATIGUE WAS A FACTOR IN THIS EVENT. THE FLT SEGMENT START UNEVENTFULLY. HOWEVER; AFTER DEP; CLBING THROUGH 17000 FT WE RECEIVED A L AFT FUEL PRESSURE AND R FWD FUEL PRESSURE WARNING. THIS IS THE FIRST THING THAT GRABBED OUR ATTENTION. THEN; MAYBE FIVE SECONDS AFTER THAT WE GOT AN EQP OHT INDICATION; AND FOLLOWED BY PITOT STATIC SYSTEM FAULTS (PROB HEAT; CAPT PITOT; L AUX PITOT; AND L AOA). THE FO WAS FLYING THE ACFT AND WAS INSTRUCTED BY ME TO CONTINUE TO FLY AS I BEGAN TO RUN THE APPLICABLE CHKLISTS. NEEDLESS TO SAY; THINGS WERE DETERIORATING RAPIDLY; WHICH MADE CHKLIST SELECTION DIFFICULT. AS I BEGAN TO READ THE CHKLIST WE LOST BOTH EADI'S AND WE HAD WXR FAIL WARNING ON THE EHSI. I SELECTED THE ALTERNATE EFI; AND IT DID NOT CHANGE THE FAULTY DISPLAY; SO I SUBSEQUENTLY DESELECTED IT. WE THEN DECLARED AN EMER AND REQUESTED VECTORS BACK TO ZZZ FOR A VISUAL APPROACH. WE WERE NOT ABLE TO DETERMINE WHAT WAS THE CAUSE OF OUR ESCALATING PROBLEMS; AND WERE CONCERNED AS TO WHAT WE WERE GOING TO LOSE NEXT. HOWEVER; I KNEW WE HAD TWO OPERATIONAL ENGINES; AND EXPEDITIOUSLY TURNED THE AIRPLANE AROUND; RAN ALL NORMAL CHKLISTS; AND LANDED. AFTER TOUCHDOWN THE THRUST REVERSERS WOULD NOT DEPLOY. FIRE CREWS WERE STANDING BY; BUT WE DID NOT NEED FURTHER ASSISTANCE. WE TAXIED UNEVENTFULLY TO PARKING AND SHUT DOWN.CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR HAS BEEN IN CONTACT WITH HIS ACR BUT THE CAUSE(S) OF THIS FAILURE HAVE YET TO BE DETERMINED. THE MOST PUZZLING ASPECT WAS THE LOSS OF BOTH EADI'S. A SINGLE POWER LOSS SHOULD NEVER PERMIT THE LOSS OF BOTH FLT INSTRUMENTS.