Randy Pausch, a computer science professor at Carnegie Mellon, had recently been diagnosed with terminal cancer. But the lecture he gave--"Really Achieving Your Childhood Dreams"--wasn't about dying. It was about the importance of overcoming obstacles, of enabling the dreams of others, of seizing every moment (because "time is all you have...and you may find one day that you have less than you think"). It was a summation of everything Randy had come to believe. It was about living.
This has been around for a while now, but if there's anybody out there who hasn't watched this (or listened to it; no need to watch the video, a podcast is fine) it's really worth it. I hate to sound like a sappy fanboy, but this is truly and honestly an entertaining, thought-provoking, and inspiring lecture. Truly an hour (plus) well-spent.