Intense interest in the Guantanamo detainees' cases of Boumediene v. Bush (06-1195) and Al Odah v. U.S. (06-1196) has led the United States Supreme Court to take the rare step of releasing the audio file of today’s oral argument immediately after the argument.
You’ll find the Boumediene/al-Odah oral argument audio [RealPlayer required] on C-SPAN's Supreme Court page. Look for the link "Supreme Court Oral Arguments: Boumediene v. Bush & Al Odah v. United States." You can also follow along in the written transcript of the argument [PDF; 92 pages].
For more background on these cases, take a look at the SCOTUSWiki page on Boumediene and al-Odah. This page analyzes the case in detail, and links to key documents, selected news reports, and posts from SCOTUSblog. It will include a recap of the oral argument as soon as the authors pull one together - probably sometime later today.
[Update] SCOTUSblog has posted a round-up of news reports on the Boumediene/al-Odah argument, and Oyez.org now has an MP3 file of the oral argument.