It's so easy to get distracted from writing. This morning I put some clothes in the washing machine, emptied and refilled the dishwasher, read some email and some friends' blogs, and wrote two blog posts (about the Antichrist and pavement poetry) before I started. Probably the secret is to download all the articles you want to cite before you start writing, otherwise the temptation to digress is too great. But that's not really the way my thought processes work; I make a point and only then am I reminded of the article from which I got the idea for it.
I also wrote the previous post just before going to make some lunch. I've just invented a yummy combination: wholemeal tortillas fried in butter, with a topping of mackerel in green peppercorn sauce, and little gem lettuce. Now that was a worthwhile distraction.