The New York Metropolitan Opera has been doing some incredibly cool things lately by putting archived productions of hundreds of operas, audio files, and even high definition video online for subscribers to view at any time.  They have even gone so far as to stream live operas directly into theaters all over the United States.  Now they have announced that for one weekend only (May 1-3, 2009) they will be opening up the web site for everyone to view or listen to the archives for free.