[dabent]

PG has an interesting approach to this: http://www.paulgraham.com/distraction.html

There's also the "noprocrast" setting in your HN profile which won't let you use for more than a certain amount of time.

I haven't implemented either approach. I've found that plugging in my headphones and listening to music or even spoken word gets me into one of those 60-90 minute zones of one-task productivity.