I've been enjoying all the people doing weeknotes, inspired by the BERGians (though Ben reckons they got the idea from us.) I particularly like the different way people have thought about their week numbering system - BERG started at week 217, Rattle at week 1189.
I'm going to do them myself - starting at week 2000 - because, looking at some actuarial tables, I've realised that, if I'm lucky, I've got about 2,000 weeks to live. So counting them down, working out whether it was a good use of a week, might be 'usefully focusing'. (Or deeply morbid, but let's assume not.)