Not sure if this has been posted before. Damn shame if it hasn't, but I couldn't find it in search.
The Opera Machine ( newbielink:http://www.roh.org.uk/opera-machine [nonactive]) is a 17 camera broadcast of Act III of Die Walküre from the Royal Opera House. Most cameras are back stage. Includes a commentary audio track and the show call, as well as a digital version of the Prompt Copy.
Fascinating stuff for when you've got several hours to spare.