To the best of my knowledge, CVR transcripts of any of the four 9/11 aircraft are not available. Unlike previous "traditional" accident investigations where the NTSB was the lead agency, the events of 9/11 were terrorist, criminal acts, and FBI was the lead agency. As such, folks shouldn't expect to see full NTSB-type reports with CVR transripts. The families may have been allowed to see them by the FBI, but I doubt you'll see and wide-spread release to the general public anytime in the near future.
Another option for you topic-wise was how all the flights that were in the air the morning of 9/11 were made to land ASAP when they decided to close the airspace. I've got some links, if that's an acceptable substitute topic.
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