Post Made Community Wiki by Alan Barber
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For keeping my attention up I use doodles. I always have a pen and a notepad lying behind my keyboard and doodle away. It isn't more then scrabbling on a piece of paper without any meaning but it keeps my attention up just enough and doesn't get me distracted so I can snap right back to what I was working on.

I've done this all my life unconsciously but recently found a wiki about it: http://en.wikipedia.org/wiki/Doodle