Oral arguments on the first data-mining case to reach the U.S. Supreme Court are being heard today.  
I thought there might be a way to listen to the actual arguments live, but that doesn't seem to be the case.  (Ridiculous in the 21st century, I say, if we claim to be trying to keep citizens engaged.)
But transcripts are put online pretty quickly.  Here's a site I've found:
http://www.supremecourt.gov/oral_arguments/argument_transcripts.aspx