Nicholas Felton has released the latest version of his "annual reports" - a collection of all the data that makes up his life. As someone who has trouble keeping track of the movies he's watched, I'm very jealous of his ability to consistently keep track of this stuff.
After the internet design community started spooging over these things a few years ago, he set up daytum, a website to help people collect these various discrete bits of information and to present them in a "Feltron Annual Report" kind of way. And yet according to the "about" page of the report, (and even according to his account page on daytum), he doesn't use it himself. I dunno, I just found that interesting.