I'm a big fan of top whatever lists. Usually grouped in multiples of five, the lists make for a quick read and a fast track to quasi authority on subjects ranging from the smartest dog breeds to the most fattening fast food entrees. I particularly enjoy reading about the worst cities in the U.S., because I know Detroit is going to be at the top, and for some perverse reason, I think that's funny.
With lists, it's usually read it/forget it, then move on to new minutiae. However, there's one list in particular that I find myself referencing on a regular basis. Titled “5 Top Regrets of Dying Patients,” it's a compilation of interviews with people during their final stage of life. If any group should have insight on missed opportunities, it's those who know they have run out of time. While the data is from the dying, the target audience is the rest of us who still think we will live forever.