The Writing Center at the University of North Carolina has a great article on Procrastination.
While it is geared toward writing and specifically college students completing their writing assignments, the information can be not only be applied to your writing assignments (reports, emails, memos) it has great value in educating you on why you procrastinate.
The article is fairly long but the content is first class. I will be printing this out and putting it in my reference library. This is definately a must read.