I'm not sure how much of this is a tip or trick, but I have a "life goals" list of tasks, which is basically my bucket list - things I want to do before I die.

The one task that's a little unusual, though, is marked with my estimated lifespan, as calculated by Wolfram-Alpha (http://www.wolframalpha.com/input/?i=life+expectancy+male+canada+32) . I find it helps me keep perspective on all the small stuff on my todo list, to periodically see a reminder that my time on this planet is finite. This helps me focus on what's truly important and keep a good perspective on what's not.