Randy Pausch, a computer science professor diagnosed with terminal cancer, clearly understands the value of life. His thoughts on carpe diem, achieving your childhood dreams, and materialism are precise, inspired, and honest (no gimmicks here).
At the time of his discourse (Sept. 2007), doctors said Pausch would have “three to six months” to live. As of today, he is still alive. His original full-length lecture at Carnegie Mellon can be found here.