Aaron Swartz has a moderately in­ter­est­ing piece on pro­duc­tiv­i­ty and pro­cras­ti­na­tion.

We all pro­cras­ti­nate. I certainly pro­cras­ti­nate.

Sometimes my pro­cras­ti­na­tion is tantamount to making sure that my pencils are very, very sharp. More often, I find myself surfing the web, free as­so­ci­at­ing off in random directions. There's no end to the fas­ci­nat­ing dis­trac­tions.

In lesser cases, I pro­cras­ti­nate because I'm bored or not fully engaged in what I'm doing.

When I have a more severe case, I think fear is the root cause. I don't really know how to proceed, I don't really understand what it is that I'm supposed to be doing, and I don't really want to come to grips with it. And so …continue.