A B737 FLT CREW BECOMES DISTR AND FORGETS TO SET THE FLAPS FOR TKOF RESULTING IN AN ABORTED TKOF.

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A TKOF WAS ATTEMPTED BY THE FO FROM RWY 7 WITH THE IMPROPER CONFIGN FOR TKOF (NO FLAPS WERE EXTENDED). UPON HEARING THE TKOF WARNING HORN; I IMMEDIATELY INITIATED A REJECTION AT APPROX 10 KTS. CONTRIBUTING FACTORS: GND CTL INFORMED US OF A 25 MIN DELAY REQUIRED FOR TKOF ON RWY 25; HOWEVER; IF WE WANTED RWY 7 IT WOULD BE AVAILABLE WITH A 7 KT TAILWIND. WE TOLD THE CTLR WE WOULD HAVE TO GET BACK TO HIM; SINCE WE WERE FULL/HVY AND THE TAILWIND MIGHT BE A FACTOR. WE WERE ASKED TO INFORM THE CTLR ASAP; SO HE COULD BUILD A HOLE FOR US. THE REASON RWY 25 WAS UNAVAILABLE WAS DUE TO A SPECIAL EVENT AT FAIRCHILD AFB (5 MI AWAY). THE RADIO CALL FROM THE GND CTLR CAME JUST AFTER THE FO CALLED 'STANDING BY FLAPS.' I ASKED THE FO TO HOLD OFF ON SELECTING THE FLAPS UNTIL WE DETERMINED WHICH; IF ANY; FLAP SETTING AND BLEED CONFIGN WOULD WORK OFF OF RWY 7. (BROKEN HABIT PATTERN!) HE COMPUTED THE DATA IN THE PERFORMANCE COMPUTER AND WE DETERMINED IT WAS POSSIBLE WITH FLAPS 5 DEGS AND BLEEDS OFF. I ASKED THE FO TO RELAY THIS TO THE GND CTLR; AS WE WERE 45 MINS BEHIND SCHEDULE AND HE WANTED TO KNOW ASAP. THE FO INFORMED THE GND CTLR; WHOSE RESPONSE WAS 'ROGER; YOU ARE CLRED TO TAXI TO RWY 7.' GETTING CAUGHT UP IN THE MOMENT; WE BEGAN TO TAXI WITHOUT THE FO STATING 'STANDING BY FLAPS' A SECOND TIME. IN OUR MINDS WE HAD ALREADY ACCOMPLISHED THE BEFORE TAXI CHKLIST SINCE WE WERE GIVEN TAXI CLRNC. (WE DON'T CALL FOR TAXI UNTIL THIS CHKLIST IS COMPLETE.) IN OUR MINDS WE SIMPLY FAST FORWARDED PAST THE BEFORE TAXI CHKLIST AND COMPLIED WITH THE TAXI INSTRUCTIONS. THE EVENT WAS JUST OFF OF THE FINAL APCH TO RWY 7. WE WERE BOTH SO MESMERIZED BY THE SHOW THAT I FAILED TO CHK THE TKOF WARNING HORN AFTER RINGING THE FLT ATTENDANTS AND PERFORMING THE BEFORE TKOF CHKLIST. THE REST IS HISTORY. MY HUMBLE APOLOGIES WITH MUCH LEARNED ABOUT THE HUMAN FACTORS SIDE OF CHKLIST USAGE. SUPPLEMENTAL INFO FROM ACN 625620: WE INFORMED THE TWR OF THE ABORTED TKOF AND WERE TOLD WE COULD DO A 180 DEG TURN ON THE RWY AND TAXI BACK FOR DEP; SINCE THERE WAS NO ARRIVING TFC. WE DID SO AND COMPLETED THE APPROPRIATE CHKLIST: BEFORE TAXI; AND BEFORE TKOF; SET THE CORRECT FLAPS SETTING; AND ACCOMPLISHED THE TKOF WITHOUT ANY FURTHER COMPLICATIONS. LESSON LEARNED: DON'T BE IN A HURRY! WATCH FOR BREAKS IN THE 'NORMAL' CHAIN OF EVENTS. BE SURE YOU HAVE ACCOMPLISHED ALL THE APPROPRIATE CHKLISTS DURING EACH PHASE OF OP! DO NOT BECOME DISTR WITH OUTSIDE INFLUENCES THAT DO NOT PERTAIN TO THE SAFETY OF FLT. BACK UP THE CAPT AND MAKE SURE ALL CHKS ARE BEING ACCOMPLISHED. AND; MY OWN PERSONAL HABIT WILL BE FROM NOW ON TO DOUBLECHK FLAPS; TRIM SPD AND AUTOBRAKE SETTINGS PRIOR TO EACH AND EVERY TKOF.