Ask HN: What lesser-known accessories do you use with your computer?
I have a heating pad under my keyboard which keeps my hands warm in the winter.  Was like $20 on amazon, and I can't even begin to describe how amazing it is, since I was really tired of always having a mug of hot water / tea / coffee to hold and didn't want to keep the heat on my house super high when I could just wear a sweatshirt and be fine except my fingers.