TKOF ABORTED WHEN FLC RECEIVES A TKOF WARNING. FLAPS NOT EXTENDED FOR TKOF.

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WE GOT INTO DENVER 2 HRS LATE AND WERE TOLD TO FLY DEN- OMA INSTEAD OF DEADHEAD DUE TO DELAYS. THIS WAS THE BEGINNING OF THE CHAIN OF EVENTS LEADING UP TO THIS INCIDENT. WE WERE TIRED DUE TO A LONG DAY WITH DELAYS; WE HAD A CHANGE AND WERE TOLD TO FLY INSTEAD OF RIDE; AND WE NOW HAD TO RUSH OVER TO THE OTHER SIDE OF THE ARPT AND HURRY AND TKOF. THE PRE FLT CHKS WERE RUSHED; WE HAD TO BE DEICED AND THERE WAS PACKED ICE AND SNOW ON THE TXWYS. WITH THESE ICY CONDITIONS; OUR COMPANY PROC IS TO TAXI OUT WITH THE FLAPS UP TO PREVENT ICE ACCUMULATION ON THE FLAPS; THEN SET THE FLAPS TO TKOF POS RIGHT BEFORE TKOF. THIS IS A MAJOR CHANGE FROM OUR NORMAL FLAP PROC. THE BEFORE TKOF CHKLIST WAS RECENTLY CHANGED TO ATTEMPT TO STANDARDIZE THE CHKLISTS FOR ALL THE DIFFERENT FLEETS OF ACFT. SEVERAL IMPORTANT ITEMS WERE REMOVED (SUCH AS CHKING HDG INDICATIONS; ANTI-SKID SWITCHES; FLT DIRECTORS; ETC). THE FLAP POS CHK IS NOW THE FIRST ITEM ON THE BEFORE TKOF CHK (WHICH IS DONE WHILE TAXIING OUT) AND IS NEVER CHKED AGAIN. AS WE TAXIED OUT FOR TKOF; I RAN THE CHKLIST AND LEFT THE FLAPS UP AS PER THE COLD WX PROC. I INFORMED THE CAPT OF THIS. AS WE APCHED THE RWY FOR TKOF; TWR ASKED US IF WE WERE READY; WE SAID 'YES;' AND THEY CLRED US FOR IMMEDIATE TKOF. THE CHKLIST THEN LEADS YOU TO CHK THE 'FINAL ITEMS' AS YOU TAKE THE RWY. THESE FINAL ITEMS DO NOT INCLUDE ANOTHER CHK OF THE FLAP POS. I SAID 'CHKLIST COMPLETE;' THE CAPT ADVANCED THE THROTTLES TO TKOF PWR SETTING; AND WE GOT THE TKOF WARNING HORN. IT WAS AT THIS POINT THAT WE REALIZED THAT WE HAD ATTEMPTED TO TKOF WITH NO FLAPS -- A POTENTIALLY FATAL ERROR. WE ABORTED THE TKOF; RESET THE FLAPS; AND TOOK OFF. I BELIEVE THE CONTRIBUTING FACTORS TO THIS INCIDENT WERE: A CHANGED AND CONSEQUENTLY; INADEQUATE CHKLIST; A CHANGE IN FLAP PROC DUE TO ICY CONDITIONS; A RUSHED TKOF; AND CREW FATIGUE. FORTUNATELY; THE TKOF WARNING HORN SYS WORKED AS IT IS SUPPOSED TO; OTHERWISE WE WOULD HAVE BEEN JUST ANOTHER CRASH STATISTIC. MY NEW PERSONAL PROC IS TO CLIP THE CHKLIST TO THE YOKE NOTE IF ANY CHK IS CHANGED.