PocketJustice.

A free iPhone app:

PocketJustice brings the U.S. Supreme Court down to earth through abstracts of the Court's constitutional decisions and access to its public sessions. The application includes voting alignments and biographical sketches for all 110 justices. PocketJustice harnesses recordings of the Court's public proceedings to deliver hundreds of hours of oral arguments and opinion announcements. In many of these cases, PocketJustice provides synchronized, searchable transcripts identifying all speakers. This version offers information and audio for the top 100 constitutional law cases. 

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