Transcripts & audio of the March 28, 2012, hearing on the Patient Protection and Affordable Care Act (severability issue) have been posted on the Supreme Court's website:
Transcript: http://www.supremecourt.gov/oral_arguments/argument_transcripts/11-393.pdf
Audio: http://www.supremecourt.gov/oral_arguments/argument_audio_detail.aspx?argument=11-393