Seth Godin posted a list of books to help with motivation and getting things done http://www.squidoo.com/a-diet-for-your-mind.
One has stood out for me and I spent a whole £6 and bought it: Do the Work by Steven Pressfield. Short, brief and to the point it helps you get that project done.
A taster of the book in my own words:
Resistance is at the top of the list of the forces gathered against us completing an enterprise.
Activities that most commonly elicit resistance:
1. The pursuit of any calling in writing, painting, music, film, dance or any creative art.
2. Any diet or health regimen.
3. Any program of spiritual advancement.
4. Any activity whose aim is the acquisition of chiseled abdominals.
In other words, any act that rejects immediate gratification in favour of long-term growth, health or integrity.
If this sounds something that could apply to you then I think you might enjoy it as much as I am.