Magic Review sites
These sites offers reviews of magic effects, books, DVDs, et cetera. Remember that reviews are merely the opinion of the reviewer and contain his or her biases. If you have a question about a trick, consult the various forums and, of course, attempt to contact the creator or manufacturer. Generally, unless you are simply trying to determine the method, most creators will generally be quite helpful. There are, of course, exceptions. But give it a shot.