I have a few printouts stuck to my wall with common snippets I use frequently but often have to look up....regexes, sublimetext shortcuts, db schemas, etc.

I also have one big notebook that serves as a day to day scratchpad for projects that I'm working on, and a smaller notepad that I use as my daily to do list. Every day, the first thing I do at work is pull out this smaller pad and jot down a quick task list, by hand. I've tried the online task lists (I'm basically addicted to trying them) but at the end of the day I still go back to the old school pen and paper approach. Whatever works for you.

Aside from the prinouts, notepads and obvious stuff like monitor/laptop, I have a coffee mug and nice pair of stereo headphones for when I need to tune out.