THE LATE SHOW with David Letterman is looking for talented, creative people to perform safe, one-of-a-kind acts, which haven't been seen anywhere else, for its "Is This Anything?" segment. Acts should be original, fun, safe, physical and fast-paced. Anyone interested in auditioning should email a short description of his/her act, with a link to a video of it, to tfoster@cbs.com. Be sure to include accurate phone contact information.