According to a scientific study (so it must be true) people who research by following loads of links on the interwebs and not concentrating on the job in hand don’t tend to do as well as those who focus a bit. No kidding. I’d love to do a study like this. Take something that everybody with a bit of common sense already knows and then get paid a lot of money to prove that is is true after all. I suppose there are other studies in the works involving bears in the woods and the religious affiliation of the pope.
If you follow things like LifeHacker you will know all about techniques that you can use to improve your focus, even going to extremes like turning off internet access so you can get on with something important. Worth a look.