A310 RETURNS FOR IMMEDIATE LNDG AFTER EXPERIENCING A CARGO COMPARTMENT SMOKE WARNING ACCOMPANIED BY ACRID ODORS ON THE FLT DECK SHORTLY AFTER TKOF.

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THE CAPT AND FO COMPLETED A NORMAL PREFLIGHT INSPECTION. THE ACFT WAS RELATIVELY CLEAN WITH NO MELS OR CDLS. ACFT LOADING; PUSHBACK; ENGINE START; AND TAXI WERE ALL NORMAL. ACFT CLRED TO TAXI. THE FO WAS FLYING THE LEG. AT TAKEOFF POWER APPLICATION; CAPT NOTICED A SLIGHT; UNIDENTIFIABLE ODOR. AT 100 KNOTS PLUS; THE ODOR WAS STILL PRESENT AND INTENSIFYING BUT NO OTHER WARNINGS. ROTATION AND GEAR RETRACTION WERE NORMAL WITH ODOR BECOMING VERY INTENSE. AT APPROXIMATELY 400 FT; THE CRC SOUNDED WITH A RED ECAM INDICATING MAIN DECK CARGO SMOKE. CAPT INSTRUCTED THE FO TO CONTINUE TO FLY THE ACFT WHILE THE CAPT COMPLETED THE CHKLIST. THE FO DECLARED AN EMER WITH TOWER. AFTER DONNING AN OXYGEN MASK; CAPT TOOK THE ACFT AND TOLD THE FO TO DON HIS OXYGEN MASK. CREW ESTABLISHED COMS AND REQUESTED AN IMMEDIATE RETURN. THE TOWER OFFERED TWO RWYS. CAPT CHOSE; TURNED DOWNWIND AND BASE; AND TUNED THE ILS FREQUENCY AND COURSE. CAPT INSTRUCTED THE FO TO PUT THE GEAR DOWN AND COMPLETE THE BEFORE LNDG CHKLIST. THE CHKLIST WAS COMPLETE AND ACFT STABLE AT 1000 FT. NORMAL LNDG WITH ACFT COMING TO STOP AT INTERSECTION WITH TXWY CHARLIE. CAPT TEMPORARILY REMOVED HIS OXYGEN MASK TO CHECK FOR FUMES AND NOTED THE CONTINUING PRESENCE OF VERY STRONG FUMES. WE CONTACTED GROUND AND THE FIRE TRUCKS AND INFORMED THEM THAT WE WERE EVACUATING THE ACFT. CAPT REVIEWED THE EVACUATION CHKLIST AND INSTRUCTED THE FO TO BLOW THE SLIDES. THE L SLIDE DID NOT COMPLETELY DEPLOY (DOOR BLEW OPEN BUT THE SLIDE DID NOT DEPLOY). THE R SLIDE DEPLOYED NORMALLY. WE COMPLETED THE EVACUATION AND GAVE THE FIRE DEPARTMENT THE PAPERWORK AND ACFT. REGARDING THE ECAM DESCRIBED ABOVE; THE LEFT ECAM INITIALLY GAVE US A RED 'MAIN DECK CARGO SMOKE' INDICATION THAT IMMEDIATELY CHANGED TO THE AMBER ECAMS. IT FLASHED BACK AND FORTH FROM RED TO AMBER THROUGH SEVERAL CYCLES AND THEN REMAINED ON THE AMBER ECAM PAGE.