You can now listen to recordings of argument here>. There's a link from the Sixth Circuit's main page for "Courtroom Audio."
As painful as it may be, it is good to listen to your own arguments - it helps you pick up on your verbal tics, the clarity of speech, etc. Another tip: don't start speaking until you get up to the podium and get your notes situated. No use having your time start before you're really ready.