Everyone watch this. Really. I mean it.
It's been making the rounds for a few months now. Yes, it's long (about an hour, plus some post-lecture festivities), but it is so worth it. This is Professor Randy Pausch giving his "last lecture". The original idea was for Carnegie Mellon professors to give the lecture they would give if it was their last. In Pausch's case, it's a reality: he's dying of pancreatic cancer and has months to live.
It's funny, and it's beautiful.
Really. Take the time. Watch it.
If you want to keep up on Pausch, he has a site here.