You've no doubt read about this by now, Randy Pausch, a professor at CMU was diagnosed with terminal pancreatic cancer and was asked to give a final lecture. The lecture itself is about dreams, realizing you own and helping other realize theirs, if you haven't watched it yet take an hour out of your day...I think we lose sight of the real point in our lives sometimes...this is a wake-up call.
Personally I remember working with very sick elderly people whilst on vacation at university, the message I got from every single one is that none of them wished they had worked more...spending time with family was far and away what they said made life richer. This video really got to me!
UPDATE found an embeddable thingy (umm...video player, seems like there should be a cooler name for these, umm...vidlet!) on Dan Woolston's blog...