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- White boards and to-do lists, if possible.

- Freedom or similar Internet-off software, if you're the kind of person who is susceptible to such challenges. http://www.paulgraham.com/distraction.html

I've tried white boards few times and it never stuck. I do like to use small paper notebooks, one for each project.

+1 small whiteboards

If your mind wanders while working, quickly write down the smaller tasks you need to do, no matter how small. Keeps focus.