For those of you who've ever asked me how I do it, here's one place to start searching. This past Saturday's live broadcast of the radio program, This American Life, offered two stories on magic; one featuring Teller of Penn & Teller fame, the second David Copperfield's Vanishing Statue of Liberty from 1983. The radio program is now available online here.
The first half was about Teller and his quest to master a new piece of magic; the method of which he revealed during the interview. The second half of the program revealed, and confirmed, a different piece of magic; David Copperfield's Vanishing Statue of Liberty. Without permission of the performer, or the creator.
I don't think it's a good idea to reveal magic that belongs to somebody else regardless of how old it is, or how easy is it to find an answer on google.
Interestingly, I think we learned more by listening to the Teller interview then the Copperfield revelation.
I'm a big, long time fan of This American Life's creater and host, Ira Glass, and delighted to learn that he was a magician in his youth, but saddened to hear the broadcast, which I felt was in poor form.