EMB145 FLT CREW TAKES OFF WITHOUT CLRNC AND CAUSES A TAXIING B737 FLT CREW TO HAVE A RWY INCURSION AT MCO.

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ON TKOF ROLL ON RWY 17R I SAW A B737 APCHING THE RWY FROM TXWY F; AT ABOUT THE SAME TIME THE TWR TOLD THEM TO HOLD SHORT OF RWY 17R. THEY STOPPED; THEN RPTED OVER THE HOLD SHORT LINE. AS I SAW THE APCHING ACFT IN A HIGH-SPD TAXI; I KNEW I WAS IN THE WRONG; AND WAS ABOUT TO ABORT THE TKOF; BUT AT THAT TIME THE TWR ISSUED THE HOLD SHORT AND THE B737 LOOKED TO BE ABLE TO STOP. SO I CONTINUED RATHER THAN ATTEMPTING A HIGH-SPD ABORT. THE B737 LOOKED TO HAVE THEIR NOSE OVER THE HOLD LINE; AS WE ROTATED. SOME FACTORS THAT ATTRIBUTED TO THE INCIDENT WERE; A COM PROB WITH THE FLT ATTENDANT RECEIVING IOE AT THE SAME TIME WE WERE GETTING OUR POS AND HOLD INSTRUCTIONS; WHICH DIVERTED SOME OF MY ATTN FROM THE TWR INSTRUCTIONS. I WAS ALSO ANXIOUS TO GET TO OUR OVERNIGHT BECAUSE OF THE SHORT NIGHT. SUPPLEMENTAL INFO FROM ACN 710312: WE WERE CLRED TO LAND RWY 17L AT MCO. WE MADE A VISUAL APCH AND LANDED RWY 17L. I WAS THE PF. WE CLRED RWY 17L AT TXWY F. MY FO READ BACK THE INSTRUCTIONS AND I REPEATED THEM OUT LOUD. WHILE TAXIING W ON TXWY F; THE TWR ISSUED A NEW TAXI CLRNC TO US. WE WERE NOW CLRED TO CROSS RWY 17R AT TXWY F; JOIN TXWY G; N TO THE GATE. ONCE AGAIN; MY FO READ BACK OUR NEW CLRNC AND I REPEATED THEM OUT LOUD. TWR ALSO SAID TFC WILL BE HOLDING IN POS RWY 17R. AS WE APCHED THE INTXN ON RWY 17R AND TXWY F; I TURNED ON ALL EXTERIOR LIGHTS; LOOKED TO MY L AND SAID; 'CLR L.' MY FO SAID SOMETHING LIKE; 'THIS GUY HAS A LOT OF LIGHTS ON.' THIS IS NOT WHAT I EXPECTED TO HEAR. I EXPECTED TO HEAR 'CLR R.' AS I TURNED MY HEAD TO THE R; TWR CAME UP ON FREQ AND TOLD US TO HOLD SHORT OF RWY 17R. I BRAKED AGGRESSIVELY TO A STOP. MY NOSE GEAR WAS PAST THE HOLD SHORT LINES; WE WERE ON RWY 17R. MY FO TOLD THE TWR; 'WE HAVE BREACHED THE RWY.' I'M NOT SURE WHY I DID THIS; HOWEVER; WHILE MY FO WAS CALLING THE TWR; I TURNED OFF THE EXTERIOR LIGHTS. LOOKING BACK; I THINK THAT WAS A MISTAKE. NOT 2 SECONDS LATER; AN AIRPLANE TOOK OFF IN FRONT OF US. I'M NOT SURE THE TYPE OF JET (MAYBE A CRJ; EMB145 OR MD80) OR THE COMPANY. AFTER THE JET GOES BY WE ARE RECLRED TO CROSS RWY 17R TXWY G TO THE GATE.