A DEP B737-300 FLIES THE SOUND ABATEMENT HEADING FOR RWY 33L AFTER DEP FROM RWY 27 AT BOS; MA.

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FO WAS PNF; FLT FROM BOS-PHL. TKOF ON RWY 27; STANDARD SID. WHEN SWITCHED TO DEP CTL; FREQ WAS BUSY SO CONTINUED ON SID AND WAITING FOR RADIO TFC TO CLR SO I COULD MAKE INITIAL CONTACT WITH ATC. FINALLY DID; AND AFTER A SHORT WHILE; DEP CAME BACK AND ASKED US WHAT OUR HEADING WAS. I READ BACK 315 DEG HDG. ATC THEN ASKED WHAT RWY WE DEPARTED FROM. AT THIS POINT SOMETHING SEEMED AMISS; SO I TOLD ATC TO STANDBY. AFTER DISCUSSION WITH CAPT AS TO DEP RWY; ATC CAME BACK TO GIVE US AN IMMEDIATE VECTOR TO THE S; AND AGAIN REITERATED THAT WE HAD DEPARTED FROM RWY 27. WE THEN REALIZED THAT WE HAD BRIEFED THE DEP FOR RWY 33L; BUT HAD DEPARTED RWY 27. ATC SAID IT HAD BEEN NO BIG PROB; BUT THAT WE SHOULD 'BE MORE CAREFUL NEXT TIME.' THIS WAS AN UNDERSTATEMENT; AND A CHARITABLE ONE AT THAT. THE POSTMORTEM: CAPT BRIEFED WRONG SID; AND FO DID NOT CATCH IT. THE FOLLOWING FACTORS ALL CONTRIBUTED TO THIS. LACK OF ATTN TO SID BRIEFING; A BIT COMPLACENT -- NOT HAVING BEEN TO BOS MUCH LATELY; AND ESPECIALLY NOT HAVING TAKEN OFF ON RWY 27 FOR OVER A YR; SO THE NORMAL TURN TO THE S; AND AWAY FROM DOWNTOWN BOSTON; WAS NOT STORED IN THE MENTAL 'MEMORY BANKS;' ALTHOUGH IN RETROSPECT; BOTH THE CAPT AND FO ADMITTED THAT TURNING OVER THE CITY OF BOSTON 'DIDN'T SEEM RIGHT;' BUT NOT WRONG ENOUGH TO LOOK AGAIN AT THE SID. WX WAS GREAT; AND TFC NOT TOO BAD; SO IT WAS EASY TO LOSE A BIT OF THE 'CONCENTRATED EFFORT' BAD WX MIGHT HAVE GIVEN US. ALSO; ON THE LOGAN 2 DEP PAGE; THEN INSTRUCTIONS FOR RWYS 33L AND 27 ARE RIGHT NEXT TO EACH OTHER; AND IT WOULD HAVE BEEN EASY TO THINK I WAS READING ONE; WHEN ACTUALLY READING THE OTHER. AGAIN; COMPLACENCY. HOW TO AVOID IN FUTURE: BE SURE TO READ AND LOOK AT DEP INSTRUCTIONS WHEN BRIEFED; INSTEAD OF JUST LISTENING TO THEM. PAY MORE ATTN TO DETAIL; ESPECIALLY WHEN NOT REAL FAMILIAR WITH THE ARPT. AND IF SOMETHING IN THE BACK OF MY MIND SAYS SOMETHING DOESN'T FEEL RIGHT; I BETTER START THINKING AND LOOKING FASTER AND HARDER BECAUSE AFTER 30 YRS IN AVIATION -- SOMETHING PROBABLY IS WRONG. SUPPLEMENTAL INFO FROM ACN 473714: UPON TAXI FOR TKOF; I WRONGLY PRESUMED THE DEP RWY TO BE RWY 33L; BECAUSE I WAS DISTRACTED; AND READ DEP INSTRUCTIONS FOR THIS RWY DURING THE BEFORE TKOF CHKLIST. UPON ARRIVING AT THE RWY (RWY 27) SEVERAL MINS LATER; I AGAIN READ OUT LOUD THE DEP INSTRUCTIONS FOR RWY 33L AS WE TOOK THE RWY FOR TKOF. THE CAUSE OF THIS DEV WAS WITHOUT A DOUBT CARELESSNESS INITIATED BY DISTR DURING A PERIOD OF FEELING RUSHED.