There are quite a few sites dedicated to busyness, managing time and getting things done (or just doing nothing). Here are some of my favorites (in no particular order):
Getting things done The original self-help time management guru.
Waitbutwhy Dedicated to the art of procrastination.
extraordinaryroutines Creative advice for getting stuff done.
James Clear James blogs, writes about and collates resources about habits and getting the most out of life.
The accelerated academy A series of blogs from the accelerated academy collective about the timescapes of academics.
Lifehacker They deal with life not just time. This is link to UK site dedicated to helping you work to live.
thetimehack The original timehack site: and experiment (in 2011) to explore the temporal benefits of getting out there and doing something new.