The most productive thing I did today was to start implementing cheat sheets. I knew about these sheets but for whatever reasons I hadn't been using them while I was working on projects. Today I made a bookmark folder named CheatSheets and started throwing some of my favorites in there.
Here are a couple:
This is Thinkfuls Ultimate Cheat Sheets for Web Developers. Tons of helpful cheat sheets.
Let me know down in the comments any of your favorite cheat sheets.