The Now Habit
Productivity Engineering
Mental Toughness
Do It Now
Getting Things Done
(Personally tested and recommended by the author of this web. Some links might lead to other websites.)
If you are procrastinating about a task, the chance is getting attractive tools for it will help you overcome it.
Example: updating this website was taking me months and I kept avoiding it. Getting good content management system and nice design for it helped me to make that task much more attractive. Nowadays, I enjoy writing new content and tweaking it a lot.
Example: if you are a writer that keeps putting off the writing endlessly, try to get a beautiful pen, wordprocessor with higher geek-ratio (if you are one of those attracted to geeky technical tools), ergonomic keyboard or beautiful plant on the desk next to your monitor.