But after a car accident 3years ago I realised that there isn't necessarily a tomorrow. I look at a beautiful sunset today and accept that I might not see tomorrow's. And if I do, it won't be exactly the same. I look at today's and appreciate it, cherish it.
Some people see this acceptance of the possibility of death as a negative thing. It is not. It drives me to make today count, knowing that I can never get around to doing everything, but that what I do should matter to me. You will not die with no regrets but you should be able to minimise them. And it isn't all about work, production or consumption -- often what I really want to be doing is lying on the grass, watching the clouds drift past, as the kids run around the garden jumping on me.
I found Viktor Frankl's book "Man's Search for Meaning" to be hugely inspiring: http://en.wikipedia.org/wiki/Man%27s_Search_for_Meaning