And courtesy of the Weekly World News ("LAST WORDS OF CHALLENGER CREW!"):
The following transcript begins two seconds after NASA's official version ends, with pilot Michael Smith saying, " Uh-oh! " Times from the moment of takeoff are shown in minutes and seconds and are approximate.
The sex of the speaker is indicated by M or F.
T+1:15 (M)
What happened? What happened? Oh God, no - no!
T+1:17 (F)
Oh dear God.
T+1:18 (M)
Turn on your air pack! Turn on your air...
T+1:20 (M)
Can't breathe... choking...
T+1:21 (M)
Lift up your visor!
T+1:22 (M/F)
(Screams.) It's hot. (Sobs.) I can't. Don't tell me...God! Do it...now...
T+1:24 (M)
I told them... I told them... Dammit! Resnik don't...
T+1:27 (M)
Take it easy! Move (unintelligible)...
T+1:28 (F)
Don't let me die like this. Not now. Not here...
T+1:31 (M)
Your arm... no... I (extended garble, static)
T+1:36 (F)
I'm... passing... out...
T+1:37 (M)
We're not dead yet.
T+1:40 (M)
If you ever wanted (unintelligible) me a miracle... (unintelligible)... (screams)
T+1:41 (M)
She's... she's... (garble) ... damn!
T+1:50 (M)
Can't breathe...
T+1:51 (M/F)
(screams) Jesus Christ! No!
T+1:54 (M)
She's out.
T+1:55 (M)
Lucky... (unintelligible).
T+1:56 (M)
God. The water... we're dead! (screams)
T+2:00 (F)
Goodbye (sobs)... I love you, I love you...
T+2:03 (M)
Loosen up... loosen up...
T+2:07 (M)
It'll just be like a ditch landing...
T+2:09 (M)
That's right, think positive.
T+2:11 (M)
Ditch procedure...
T+2:14 (M)
No way!
T+2:17 (M)
Give me your hand...
T+2:19 (M)
You awake in there? I... I...
T+2:29 (M)
Our Father... (unintelligible)...
T+2:42 (M)
hallowed be Thy name... (unintelligible).
T+2:58 (M)
The Lord is my shepherd, I shall...not want. He maketh me to lie down in green pastures... though I walk through the valley of the shadow of death, I will fear no evil... I will dwell in the house...
T+3:15 to end
None. Static, silence.
http://www.snopes.com/horrors/gruesome/challenger.asp