B737 CREW IS GIVEN WRONG DEP FREQ IN PDC AT TPA.

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PDC OUT OF TPA READ TPA 3 DEP (HDG 200 DEGS); MAINTAIN 6000 FT; DEP FREQ 118.8. THERE WAS A LARGE TSTM TO THE SE OF RWY 18R AT ABOUT 7 NM. AFTER TKOF; NO ONE WOULD ANSWER ON 118.8 AFTER SEVERAL CALLS. I BROADCAST IN THE BLIND THAT WE WERE TURNING TO A HDG OF 255 DEGS; EXERCISING CAPT'S EMER AUTH TO AVOID A LARGE TSTM; AND SWITCHED BACK TO TWR FREQ AND REPEATED THE SAME MESSAGE. TWR ASKED ME WHY WE WERE USING 118.8 AND I TOLD HIM THAT IT WAS DIRECTED ON OUR PDC (WHICH I STILL HAVE IN MY POSSESSION). WE CONTACTED DEP ON ANOTHER FREQ; AND PROCEEDED WITHOUT FURTHER INCIDENT. FURTHERMORE; I WOULD LIKE TO MAKE A GENERAL STATEMENT BASED ON MY OBSERVATIONS AS A LINE PLT OVER THE LAST SEVERAL MONTHS. I AM NOT THROWING ROCKS AT THE CTLRS AT ALL. I UNDERSTAND THAT THEY ARE BEING TOLD THAT THEY NEED TO RUN THE FAA 'LIKE A CORPORATION' AND ARE REDUCING MANNING; INCREASING CTLR WORKLOADS; AND LOSING EXPERIENCED PERSONNEL. THE INCREASED WORKLOADS ARE CERTAINLY SHOWING IN THE FORM OF 'NO COM' FOR EXTENDED PERIODS (1 CTLR WITH WAY TOO MANY FREQS); CONFLICTS WITH VFR TFC; CLRNC MISTAKES; AND A VERY UNFORTUNATE OCCURRENCE IN KENTUCKY LAST MONTH.